Wednesday
April 16, 2014

Search: Physics - Mirrors & Lenses

Number of results: 108,720

Science Help
How does a periscope work when it has 2 mirrors and light? A.Lenses refract the light B.Light bends as it travels and mirrors bend the light more C.Light travels in a straight line and the mirrors reflect the light D.Lenses and mirrors reflect the light Reflect means to bounce...
Wednesday, March 21, 2012 at 6:00pm by Derrick

Science
How does a periscope work when it has 2 mirrors and light? A.Lenses refract the light B.Light bends as it travels and mirrors bend the light more C.Light travels in a straight line and the mirrors reflect the light D.Lenses and mirrors reflect the light Reflect means to ...
Wednesday, March 21, 2012 at 6:57pm by Derrick

Physics
Identical objects are located at the same distance from two spherical mirrors, A and B. The magnifications produced by the mirrors are mA = 7.2 and mB = 1.1. Find the ratio fA/fB of the focal lengths of the mirrors.
Wednesday, April 17, 2013 at 10:44pm by Elizabeth

Physics - Mirrors & Lenses
When standing 1.25 m in front of an amusement park mirror, you notice that your image is three times taller. What is the radius of curvature of the mirror?
Sunday, March 30, 2008 at 4:26pm by Anonymous

Physics repost
1. I didnt say anything about concave mirrors. THe question was on lenses. There are two types: concave (diverging), and convex (converging). If concave lenses produce only virtual images, what does that imply about convex? Here is my previous brief response to the same ...
Tuesday, April 8, 2008 at 1:06pm by bobpursley

Physics
Two lenses are in contact. One of the lenses has a focal length of +10.0cm when used alone. When the two are in combination, an object 20cm away from the lenses forms a real image 40cm away from the lenses. What is the focal length? I am not sure how to approach this problem. ...
Tuesday, April 2, 2013 at 2:18pm by Jul

space
You could search telescopes up on the internet. A definiton for telescope is that it is a device for making distant objects appear nearer and larger by means of compound lenses or concave mirrors.
Thursday, March 25, 2010 at 9:37pm by Anonymous

physics
we put 2 mirrors perpendicular to each other and then an object in front. the result is 3 images of that object. how does the middle image occur? The middle image appears directly behind the intersection of the two mirrors, and is a double-reflection off of two mirrors. There ...
Sunday, May 6, 2007 at 6:51pm by JJ

Physics
f=focal point i=height of image o=distance of object 1/f=1/i+1/o f=i+o, f/o=i as the object's distance increase the image becomes smaller, as the objects distance decreases, the image becomes bigger. I really haven't dealt with lenses and mirrors in a while, so I could be wrong.
Thursday, March 14, 2013 at 2:55pm by Devron

science
Contact lenses improve lives. Contact lenses are an example of what? Is the answer physics?
Monday, September 16, 2013 at 2:50pm by Miai

Physics - Mirrors & Lenses
I will assume it is an upright image, behind the mirror. The distance to the image is di = -3 do because of the 3x magnification, and do = 1.25 m. The minus sign is necessary for upright virtual images. The focal length f is given by the equation 1/do + 1/di = 1/f 1/1.25 -1/3....
Sunday, March 30, 2008 at 4:26pm by drwls

science
Carnival mirrors make reflection look very odd. What market the reflections in these mirrors so strange?
Monday, November 26, 2012 at 6:06pm by stephanie

physics
please give me some idea for making a working model based on optics. Like combination of light and lenses, spectrum etc......& how can i make a working model with the use of contact lenses....
Tuesday, June 18, 2013 at 4:58pm by edward

science
How do mirrors affect the way a plant grows? Mirror, Mirror on the wall See how I grow green and tall. Answer me this question puzzling Nepal Who is the most beautiful plant of all? I guess it will depend on what you use the mirrors for. If it is collecting light, then it will...
Friday, December 8, 2006 at 6:05pm by britteny

Physics
Telephoto lenses allow one to "zoom in" on distant objects, making them bigger. A particular telephoto lens consists of a combination of two thin lenses having focal lengths of f1=20 cm and f2=−8 cm, respectively. The lenses are separated by a distance of d=15 cm. ...
Tuesday, July 16, 2013 at 12:35pm by Danny

physics
Telephoto lenses allow one to "zoom in" on distant objects, making them bigger. A particular telephoto lens consists of a combination of two thin lenses having focal lengths of f1=20 cm and f2=−8 cm, respectively. The lenses are separated by a distance of d=15 cm. ...
Wednesday, July 17, 2013 at 9:32am by andy

physics
Telephoto lenses allow one to "zoom in" on distant objects, making them bigger. A particular telephoto lens consists of a combination of two thin lenses having focal lengths of f1=20 cm and f2=−8 cm, respectively. The lenses are separated by a distance of d=15 cm. ...
Wednesday, July 17, 2013 at 1:29pm by andy

physics
Telephoto lenses allow one to "zoom in" on distant objects, making them bigger. A particular telephoto lens consists of a combination of two thin lenses having focal lengths of f1=20 cm and f2=−8 cm, respectively. The lenses are separated by a distance of d=15 cm. ...
Friday, July 19, 2013 at 8:09am by Anonymous

Physics
Two converging lenses with focal lengths 5 cm and 30 cm are placed 35 cm apart. Rays from a very distant object are impinged on the lens system parallel to the principal axis. What is the refractive power of the combination of these two lenses?
Saturday, March 26, 2011 at 4:53pm by Abby

math
A box contains four red, three blue, and six green lenses. Two lenses are randomly selected from the box. Find the probability of getting two red lenses when two are selected if the first selection is NOT replaced before the second selection is made.
Sunday, March 3, 2013 at 8:24am by b

Physics
Two plus lenses have focal lengths in the ratio 3:1. When placed together in close contact the focal length of the combination is +8.33cm. What are the focal lengths of the two lenses?
Monday, November 4, 2013 at 10:00am by Nikki

science
Carnival mirrors make reflections look very odd. What market the reflections in these mirrors so strange?
Monday, November 26, 2012 at 6:21pm by stephanie

science
Carnival mirrors make reflections look very odd. What market the reflections in these mirrors so strange?
Monday, November 26, 2012 at 6:29pm by stephanie

science
Carnival mirrors make reflections look very odd. What makes the reflections in these mirrors so strange?
Monday, November 26, 2012 at 6:38pm by stephanie

Science
Convex mirrors bulge out in the center, while concave mirrors are depressed in the center. I hope this helps. Thanks for asking.
Thursday, September 25, 2008 at 1:38pm by PsyDAG

physics
Two mirrors are placed at a 90° angle to each other. A light ray strikes one mirror 0.620 m from the intersection of the mirrors with an incident angle of 36.5°. The ray then travels a distance d before reflecting from the second mirror. (a) What is the distance d? answer ...
Saturday, May 7, 2011 at 7:25pm by bari

science
fill in the blank. Contact lenses improve lives. Contact lenses are an example of a(n)__________ .
Thursday, October 24, 2013 at 1:13pm by victoria

Science
Why are space telescopes able to make better observations in the ultraviolet and infrared ranges than ground-based telescopes? A)space telescopes are closer to the objects that they are observing B) the atmosphere absorbs or reflects much of the UV and IR radiation C) space ...
Sunday, April 15, 2012 at 7:17pm by Elena

physics
How is it that contact lenses can be thinner than bifocales but just as effective at fixing someone's sight? The power or 1/f of contact or framed glasses for the same person needs to be the same. Power is proportional to (N-1)[1/R1 - 1/R2]. N is the index of refraction of the...
Saturday, July 15, 2006 at 12:37am by Tom

Science
contact Lenses improve lives. Contact lenses are an example of an __________. my answer is indepentant variable. Someone help. it's for a science experiment.
Friday, October 4, 2013 at 12:52pm by rose

Refraction
Which tool does NOT have lenses to Refract? A. Camera B. Mirror C. Telescope D. Binoculars Some telescopes have no lenses. Look at a mirror. Do you see any lesnses there?
Monday, February 19, 2007 at 9:40pm by Missy

Physics
Two converging lenses are placed 31.0 cm apart. The focal length of the lens on the right is 22.0 cm, and the focal length of the lens on the left is 15.0 cm. An object is placed to the left of the 15.0 cm focal-length lens. A final image from both lenses is inverted and ...
Tuesday, April 27, 2010 at 9:18am by Christopher

physics
A pair of vertical plane mirrors stands with an angle of β = 56.5 degrees between them. A pencil of light approaches in a direction parallel to one of them, as shown. After the pencil has left the mirrors, in which direction will it be going? (Give your answer as the ...
Saturday, September 14, 2013 at 2:42pm by steph

Physics need work checked
Physics lenses. Please help, my math is wrong and I need second opinion.? Consider three lenses with focal lengths of 25.9 cm, -15.8 cm, and 10.0 cm positioned on the x axis at x1 = 0 m, x2 = 0.412 m, and x3 = 0.514 m, respectively. An object is at d = -121 cm. Find the ...
Wednesday, May 2, 2012 at 2:00am by Physics

Physics
metal, or a metal coated polymer http://www.wisegeek.com/how-are-mirrors-made.htm
Sunday, May 2, 2010 at 10:28pm by bobpursley

physics
the laws of strings applies: http://primes.utm.edu/mersenne/LukeMirror/mirrors/eb/mers_02.htm What is the square root of four?
Saturday, March 22, 2008 at 6:30pm by bobpursley

INFECTION CONTACT LENSES
I NEED INFORMARTION FOR THE INFECTION WHEN USE CONTACT LENSES
Saturday, November 14, 2009 at 1:53pm by KARLA

Physics
For two lenses: 1/f = 1/f1 + 1/f2 where f is the focal length of the lens combination, f1 is the focal length of the first lens, and f2 is the focal length of the 2nd lens Extending this to 4 lenses: 1/f = 1/f1 + 1/f2 + 1/f3 + 1/f4 or 1/f = 1/200 - 1/125 -1/400 + 1/142.9 1/f...
Tuesday, October 23, 2012 at 9:22am by Jennifer

physics
what are convex lenses?
Saturday, August 25, 2012 at 3:28am by help

Physics
The Place you get your haircut has two nearly parallel mirrors 5.0m apart. As you sit in the chair, yoru head is 2.0 m from the nearer mirror. Looking toward this mirror, you first see your face and then, farther away, the back of your head. ( The mirrors need to be slightly ...
Sunday, March 7, 2010 at 9:43pm by EM

Physics: Lenses
Thank you drwls for your help!
Monday, March 23, 2009 at 11:39am by Anonymous

Physics
Can mirrors create virtual inverted images?
Tuesday, February 24, 2009 at 10:42pm by Brock

Physics
wouldn't the light beam upon re-entering air be parallel to the original beam in the air? concave lenses form virtual images. They are often called diverging lenses, because they spread light apart. http://en.wikipedia.org/wiki/Virtual_image
Tuesday, April 8, 2008 at 3:52am by bobpursley

physics
They are lenses that are thicker at the middle than at the edge.
Saturday, August 25, 2012 at 3:28am by drwls

Physics
Does the law of reflection only apply to mirrors or any object?
Wednesday, April 28, 2010 at 6:44pm by Emily

Physics
Why is using mirrors to generate electricity not a common practice?
Thursday, March 20, 2014 at 1:41pm by Cherie

physics
do converging/diverging lenses work because of refraction?
Wednesday, March 12, 2008 at 4:59pm by Kurst

physics-lenses
we are different
Saturday, March 8, 2014 at 10:01pm by Marian/Melissa/Thalia/Sofia

SCIENCE: GR.10 OPTICS CONVEX MIRRORS
In each case use the mirror formula 1/do + 1/di = 1/f do = object distance di = image doistance Make sure you use negative f for the convex mirrors. The image height is di/do times the object heeight.
Sunday, March 28, 2010 at 11:55pm by drwls

Physics
Eyes, eyeglasses, contact lenses, cameras, rainbows.
Monday, February 9, 2009 at 12:21am by drwls

Physics
1) The answer depends upon what you call the "laws" of reflection. The angle of incidence is NOT equal to the angle of reflection, for a diffuse reflector. I explained my answer before. Light that is diffusely reflected is reflected at many angles, not just one. That is why ...
Tuesday, April 8, 2008 at 3:24am by drwls

Lenses
If you were to use a green laser beam to measure the focal length, would you get the same value? Does your answer bear on chromatic aberration in which a white object is focused as a somewhat blurred color image? If two lenses have exactly the same dimensions but have ...
Thursday, January 29, 2009 at 8:33pm by Blind

GS 104 Physics (Physical Science)
Trucks often have signs on their backs that say, "If you can't see my mirrors, I can't see you." Explain the physics here.
Monday, December 3, 2007 at 10:38pm by Celeste

UV
the two lenses in contact are 45 cm away from the object and the distance of the object from the image is 110 cm. if one of the two lenses in contact has a focal length of 15cm, what is the focal length of the second lens? thanks :)
Saturday, March 8, 2014 at 9:06pm by Melissa

physics
lenses that always diverge light rays that strike them is that convex or concave? I am not sure.
Sunday, March 30, 2008 at 3:52pm by Anonymous

physics
does each of the two lenses used in a microscope produce a magnification of the object being viewed?
Sunday, October 17, 2010 at 8:30pm by andy

Physics
Unless the camera is fitted with a set of lenses to turn the image right side up, yes.
Monday, March 3, 2008 at 9:10pm by DrBob222

physics-lenses
trace and describe the image formed by a convex lens (object between 2f and f)
Saturday, March 8, 2014 at 9:52pm by marian

Physics
Eyeglass lenses. Movie projectors. Cameras. Binoculars. Fiber optics (total internal reflection).
Thursday, January 5, 2012 at 7:32pm by drwls

Physics
How many times will the incident beam shown in Figure P25.3 (x = 1.90 m, y = 1.30 m) be reflected by each of the parallel mirrors? mirror on the right
Thursday, November 6, 2008 at 7:41pm by Nancy

physics
How many times will the incident beam shown in Figure P25.3 (x = 1.10 m, y = 1.80 m) be reflected by each of the parallel mirrors? mirror on the right
Sunday, September 4, 2011 at 8:24pm by nish

math
I need help finding the answer In the US about 46% of the population wear glasses or contact lenses. A sample of 85 people is taken. About how many people would you ecpect to wear glasses or contact lenses? Do I multiply .46 to 85?
Wednesday, February 3, 2010 at 3:00pm by Kyle

Comparative Essay
I need help on a camparative essay between Barbie Doll and Phenomenal Woman and I would like to include Mirrors. In Barbie Doll society will dictate to us about body image, In phenomenal woman she is confident and is telling society how good she looks and in Mirrors is not ...
Sunday, April 24, 2011 at 4:20pm by Evelyn

PHYSICS
WHAT TYPE OF MIRRORS ARE USED IN A PERISCOPE(CONCAVE, CONVEX?) ALSO,DRAW A RAY DIAGRAM OF A PERISCOPE
Saturday, March 19, 2011 at 8:31am by ADAM

physics-lenses
You must be having an identity crisis, Marian/Melissa/Thalia/Sofia. Please use the same name for your posts.
Saturday, March 8, 2014 at 9:52pm by Ms. Sue

physics mirrors
at what image distance is it difficult, but not impossible to locate a clearly focused image? i think that would be far from object.
Thursday, January 5, 2012 at 8:28pm by Shreya

Physics
Explain, with a diagram, how 2 plane mirrors could be fixed at a dangerous T-junction so that motorists approaching the junction could see all other traffic?
Friday, January 16, 2009 at 1:58pm by Nabiha

Physical Conceptual Science
Trucks often have signs on the back that say, “If you can’t see my mirrors, I can’t see you.” Explain the physics.
Sunday, September 29, 2013 at 1:08am by Miss Angie

Physics- Lenses
A planoconvex lens is to have a focal length of 28.5 cm. If made from fused quartz, what must be the radius of curvature of the convex surface?
Tuesday, May 18, 2010 at 9:21am by Cole

Physics
A room with only one window is dark even at mid-day. Explain how you could use wall-paper, furnishings and mirrors to brighten the room.
Friday, January 16, 2009 at 2:00pm by Nabiha

Physics
What type of mirror is used whenever a magnified image of an object is needed? They say its convex but why? i though convex mirrors reduce an abject ?? plz help
Sunday, November 20, 2011 at 4:47pm by Anonymous

physics
For real images in converging lenses, I know that if the object distance increases, then the image distance will decrease. However, I need to explain WHY and I don't know? Pleaes help.
Sunday, January 17, 2010 at 2:54pm by Nicole

physics-lenses
a certain Galilean telescope has a magnification of 2 times. if the focal length of the objective lens is 60 cm, how long is the telescope? thanks :))
Saturday, March 8, 2014 at 9:11pm by thalia

Science 10
I am doing my science 10 by correspondence and I came upon a question that puzzles me. Why are modern light microscopes called Compound microscopes. That and How would I "determine theactual size of the cells shown in the illistration if the field diameter measures 2.2 mm"??? ...
Monday, July 4, 2005 at 8:31pm by Mary

PHYSICS
IT DOESNT USE MIRRORS. IT USE 2*45 DEGREE GLASS PRISMS.THERFORE IT UNDERGOES TOTAL INTERNAL REFLECTION AND REFLECTS TWICE MAKING THE PERSON ABLE TO SEE
Saturday, March 19, 2011 at 8:31am by Sivashen

Biotechnology
I need a couple of ideas. For the project we are supposed to test out an idea for biotechnology product that is innovative. However, it's just 2 pages, meaning that we can't "develop" something and thus it can include a lot of assumptions. Our choices include biologic therapy...
Saturday, October 31, 2009 at 2:29pm by Alex

physics
The di stays the same, since it is determined by eyeball dimensions and indexes that do not change. Adding an eyeglass close to the eye adds additional curvature to the wavefront, so that the original 1/f of the eye's lens alone becomes 1/f = 1/f' + 1/f', where f' is the focal...
Sunday, June 8, 2008 at 10:17am by drwls

Physics
Visitors at a science museum are invited to sit in a chair to the right of a full-length diverging lens (f1 = -3.3 m) and observe a friend sitting in a second chair, 1.94 m to the left of the lens. The visitor then presses a button and a converging lens (f2 = 4.36 m) rises ...
Monday, April 22, 2013 at 1:02pm by tommm

Science
What are convex mirrors?
Thursday, September 25, 2008 at 1:38pm by Mariz

Art
Can someone please help me with this question because I am confused with this question. When doing mirror painting,children should: 1. draw and paint an object by looking at the object in the mirror. 2. draw or paint on handheld or full-length mirrors. 3. Use mirrors to look ...
Saturday, April 7, 2007 at 8:31am by Chrissie--please read --bobpursley!!

Physics
If you are wearing contact lenses with a dioptric power of 3.4 and your eye has a diameter of 2.6 cm, what is the effective focal length of your eye-contact lens combination, in centimeters?
Sunday, March 25, 2012 at 11:51pm by Morgan

Physic
Plane mirrors do not focus.
Thursday, June 9, 2011 at 5:41am by Damon

Lenses
Cheers!
Thursday, January 29, 2009 at 8:33pm by Blind

science
Lenses?
Sunday, October 17, 2010 at 2:04pm by PsyDAG

physics
A nearsighted person has a far point located only 200 cm from his eyes. Determine the focal length of contact lenses that will enable him to see distant objects clearly. does anyone have any suggestion on how to tackle this problem?
Thursday, December 6, 2012 at 12:48pm by Alex

Physics
Stand two plane mirrors on their edges and parallel to one another. Place a coin between them near one end. How many images do you see? Draw a ray diagram to explain the formation of the images.
Sunday, January 13, 2013 at 10:04pm by Lisa

Physics
Stand two plane mirrors on their edges and parallel to one another. Place a coin between them near one end. How many images do you see? Draw a ray diagram to explain the formation of the images.
Sunday, January 13, 2013 at 10:05pm by Lisa

science
list three uses of mirrors
Wednesday, March 12, 2008 at 1:23pm by adam

Physics
The following four lenses are placed together in close contact. Find the focal length of the combination. Lens 1- F'= +200mm Lens 2- F'= -125mm Lens 3- F'= -400mm Lens 4- F'= +142.9mm
Tuesday, October 23, 2012 at 9:22am by Help please

physics
state the surface powers required to produce the following lenses with +6.25D front curves. a. -0.50 DS 6. +0.50 DS c. +1.75 DS
Tuesday, October 23, 2012 at 10:33am by Help

Physics
1. wavelength = (cavity length)/50,000 (50,000 is the number of half waves between the mirrors) 2. frequency = (speed of light)/wavelength
Thursday, November 25, 2010 at 7:33pm by drwls

physics
State the surface powers required to produce the following lenses with +6.25D front curves. a. -0.50 DS b. +0.50 DS c. +1.75 DS Is a -6.75DS?....
Tuesday, October 23, 2012 at 10:50am by Help

physics
State the surface powers required to produce the following lenses with +6.25D front curves. a. -0.50 DS b. +0.50 DS c. +1.75 DS
Wednesday, October 24, 2012 at 9:46am by Anyone know the answer to this?

physics
State the surface powers required to produce the following lenses with +6.25D front curves. a. -0.50 DS b. +0.50 DS c. +1.75 DS
Wednesday, October 24, 2012 at 3:06pm by Anonymous

physics
State the surface powers required to produce the following lenses with +6.25D front curves. a. -0.50 DS b. +0.50 DS c. +1.75 DS
Thursday, October 25, 2012 at 2:42pm by Anonymous

Science
Can I please have a/any websites for convex mirrors?
Thursday, September 25, 2008 at 7:33pm by Mariz

physics
Your friend is far-sighted with a near-point distance of 512 cm. What should the focal length be for the lenses in his reading glasses? Assume the glasses are placed 2.0 cm in front of his eyes.
Tuesday, March 19, 2013 at 6:24pm by Anonymous

physics
State the surface powers required to produce the following lenses with +6.25D front curves. a. -0.50 DS b. +0.50 DS c. +1.75 DS Is a -6.75DS?....
Tuesday, October 23, 2012 at 11:44am by Help please!

Physics (mirrors)
If a virtual image occurs at 20cm "behind" a concave mirror, would u put a screen 20cm before the mirror to obtain the clearest possible image? if not, where?
Sunday, March 23, 2008 at 5:11am by Mikal

physics, lenses
it depends on the position of the object. u need to c tht if v and u bth are on same side or opposite side because tht changes the sign of v and u to positiv and negative. i hope u gt tht
Monday, March 23, 2009 at 4:55pm by chirayu

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