Search: Physics - Mirrors & Lenses

Number of results: 94,372

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

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

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
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...
Thursday, March 14, 2013 at 2:55pm by Devron

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 - 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

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
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

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
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 market the reflections in these mirrors so strange?
Monday, November 26, 2012 at 6:21pm 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? ...
Saturday, May 7, 2011 at 7:25pm by bari

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...
Saturday, July 15, 2006 at 12:37am by Tom

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

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
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 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

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

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

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

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

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

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

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...
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

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
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
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

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

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

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

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

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

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
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 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

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
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
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

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

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...
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&#...
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

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

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

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

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

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

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
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

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

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
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

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
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 Is a -6.75DS?....
Tuesday, October 23, 2012 at 10:50am by Help

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
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, 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

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 (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

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

Science?
http://www.google.com/search?source=ig&hl=en&rlz=1G1GGLQ_ENUS353&q=CONTACT+LENSES+PROBLEMS+
Saturday, November 14, 2009 at 12:40pm by Ms. Sue

Physics
Another type is the DLP (Digital Light Processing) which uses millions of tiny mirrors. They tend to be quite a bit other two types (but thinner than CRT), but can be made more cheaply in large sizes. I don't like them because they are quite dim when viewed from the side.
Sunday, December 2, 2007 at 7:51pm by drwls

math
how can you estimate heights and distances with mirrors and similar triangles?
Thursday, March 1, 2012 at 8:31pm by Leda

sci
Is global warming skepticism just smoke and mirrors?
Sunday, June 12, 2011 at 11:11am by meshelle

science- need help quickly!
Thank you for using the Jiskha Homework Help Forum. Here is something about symmetrical reflection in a kaleidoscope: 1. (Wikipedia): http://en.wikipedia.org/wiki/Kaleidoscope 2. (Physics): http://www.4physics.com/phy_demo/kaleidoscope/kaleidoscope-2.html 3. (reflection ...
Sunday, November 23, 2008 at 1:19pm by SraJMcGin

Physics Question
Some rearview mirrors produce images of cars behind you that are smaller than they would be if the mirror were flat. What is a mirror's radius of curvature if cars 23.0 m away appear .36x their normal size? I got .24 meters but it is wrong??
Sunday, April 15, 2012 at 7:26am by ###Nadine####

physics mirrors
If you have access to an image, you can always locate it. If the image is formed in outer space, you'd have to go there to find it. You can also insert an intervening optical lens or mirror to compute where the image (without the inserted element) would be.
Thursday, January 5, 2012 at 8:28pm by drwls

chemistry
Smoke and mirrors. pO2 + pH2O = Ptotal = 754 torr
Tuesday, February 7, 2012 at 11:29pm by DrBob222

Physics
Two converging mirrors of focal length 30 cm are 15 cm apart. If an object is placed 1 cm from mirror one, how far from mirror two will the second image be?
Wednesday, February 25, 2009 at 7:21am by Paul

Physics
A ray of light falls on one of two plane mirrors placed at an angle of 90 degrees. show that the direction of the ray after two reflections is parallel to the direction of the original ray.
Friday, July 22, 2011 at 9:58pm by jane

Science!
why are you focusing on lenses? Have you looked in a plane mirror lately?
Saturday, May 12, 2012 at 11:10am by bobpursley

science
the two objects lenses on a compound microscope are attached below the
Saturday, September 15, 2007 at 8:25pm by sherod

Physics
1a. Two converging lenses, each of focal length 14.4 cm, are placed 60.6 cm apart, and an object is placed 26.9 cm in front of the first. Where is the final image relative to the second lens formed? b. What is the magnification of the system?
Tuesday, March 23, 2010 at 9:35pm by Andrew

7th grade
I HAVE A HOMEWORK INFORMATION OF CONTACT LENSES PROBLEMS OR INFECTIONS
Saturday, November 14, 2009 at 12:40pm by KARLA

Physics
IMAGE: img7.imageshack.us/img7/4994/lenses.png Do I use the image distance from one mirror as the object distance from the next mirror?
Sunday, March 22, 2009 at 10:31pm by John

physics
Mirrors operate by reflecting light. They can be used to heat objects. In Boy Scouts, we were taught to communicate with them. A mirror on the moon together with a laser can be used to measure distance. The universal constant of gravity was measured with a mirror. You have ...
Wednesday, November 24, 2010 at 9:02am by drwls

GEOGRAPHY
Yes, those are great. There are also companies that make the seats, upholstery, mirrors, etc.
Thursday, February 14, 2008 at 10:49pm by Ms. Sue

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