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October 30, 2014

Search: Physics - Mirrors & Lenses

Number of results: 57,348

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...
March 21, 2012 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 ...
March 21, 2012 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.
April 17, 2013 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?
March 30, 2008 by Anonymous

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. ...
April 2, 2013 by Jul

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 ...
May 6, 2007 by JJ

science
Contact lenses improve lives. Contact lenses are an example of what? Is the answer physics?
September 16, 2013 by Miai

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. ...
July 16, 2013 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. ...
July 17, 2013 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. ...
July 17, 2013 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. ...
July 19, 2013 by Anonymous

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

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?
March 26, 2011 by Abby

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....
June 18, 2013 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...
December 8, 2006 by britteny

science
Carnival mirrors make reflections look very odd. What market the reflections in these mirrors so strange?
November 26, 2012 by stephanie

science
Carnival mirrors make reflections look very odd. What market the reflections in these mirrors so strange?
November 26, 2012 by stephanie

science
Carnival mirrors make reflections look very odd. What makes the reflections in these mirrors so strange?
November 26, 2012 by stephanie

physics
Two mirrors are placed at a 90° angle to each other. A light ray strikes one mirror 0.730 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?
May 12, 2014 by Christina

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 ...
May 7, 2011 by bari

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.
March 3, 2013 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?
November 4, 2013 by Nikki

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 ...
April 15, 2012 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 ...
April 27, 2010 by Christopher

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

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...
July 15, 2006 by Tom

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 ...
September 14, 2013 by steph

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?
February 19, 2007 by Missy

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.
October 4, 2013 by rose

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 ...
May 2, 2012 by Physics

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 ...
March 7, 2010 by EM

physics
what are convex lenses?
August 25, 2012 by help

physics-lenses
we are different
March 8, 2014 by Marian/Melissa/Thalia/Sofia

Physics
Can mirrors create virtual inverted images?
February 24, 2009 by Brock

INFECTION CONTACT LENSES
I NEED INFORMARTION FOR THE INFECTION WHEN USE CONTACT LENSES
November 14, 2009 by KARLA

Physics
Does the law of reflection only apply to mirrors or any object?
April 28, 2010 by Emily

Physics
Why is using mirrors to generate electricity not a common practice?
March 20, 2014 by Cherie

physics
do converging/diverging lenses work because of refraction?
March 12, 2008 by Kurst

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?
February 3, 2010 by Kyle

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 ...
January 29, 2009 by Blind

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 :)
March 8, 2014 by Melissa

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.
December 3, 2007 by Celeste

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
November 6, 2008 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
September 4, 2011 by nish

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 ...
April 24, 2011 by Evelyn

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

physics
does each of the two lenses used in a microscope produce a magnification of the object being viewed?
October 17, 2010 by andy

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

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
October 23, 2012 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
October 24, 2012 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
October 24, 2012 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
October 25, 2012 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?....
October 23, 2012 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 Is a -6.75DS?....
October 23, 2012 by Help please!

PHYSICS
WHAT TYPE OF MIRRORS ARE USED IN A PERISCOPE(CONCAVE, CONVEX?) ALSO,DRAW A RAY DIAGRAM OF A PERISCOPE
March 19, 2011 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?
May 18, 2010 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.
January 5, 2012 by Shreya

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.
September 29, 2013 by Miss Angie

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?
January 16, 2009 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"??? ...
July 4, 2005 by Mary

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.
January 16, 2009 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
November 20, 2011 by Anonymous

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 :))
March 8, 2014 by thalia

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.
January 17, 2010 by Nicole

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 ...
April 22, 2013 by tommm

Physics
Two converging lenses with the focal lengths of 40 cm and 20 cm are 10 cm apart. a 2.0-cm-tall object is 15 cm in front of the 40-cm-focal-length lens. Calculate the image position and height.
April 27, 2010 by Ashley

Science
What are convex mirrors?
September 25, 2008 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 ...
April 7, 2007 by Chrissie--please read --bobpursley!!

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?
February 25, 2009 by Paul

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= -6.75D? b= -5.75D? c= -4.75D?
October 23, 2012 by Can anyone help me on this question please?

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...
October 31, 2009 by Alex

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.
March 19, 2013 by Anonymous

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?
March 23, 2010 by Andrew

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?
December 6, 2012 by Alex

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?
March 25, 2012 by Morgan

Science
Can I please have a/any websites for convex mirrors?
September 25, 2008 by Mariz

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.
January 13, 2013 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.
January 13, 2013 by Lisa

physics
I am posting this question again as noone has answered it yet. 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= -6.75D? b= -5.75D? c= -4.75D?
October 24, 2012 by Please help if you can...

sci
Is global warming skepticism just smoke and mirrors?
June 12, 2011 by meshelle

math
how can you estimate heights and distances with mirrors and similar triangles?
March 1, 2012 by Leda

Physics
Ok guys, state the surface powers required to produce the following lenses with +5.75D front curves. a) -0.50DS b) +0.50DS c) +1.75DS d) -1.25DS i'm not sure if it's as straight forward as calculating the difference, eg. a) +5.75 - -0.50 = +6.25. Any help is seriously ...
November 4, 2013 by Any.help.REALLY.appreciated

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
October 23, 2012 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?
March 23, 2008 by Mikal

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??
April 15, 2012 by ###Nadine####

Physics-Need Help fast!
Two converging lenses, each of focal length 15.1 cm, are placed 40.2 cm apart, and an object is placed 30.0 cm in front of the first lens. Where is the final image formed? The image is located... What is the magnification of the system? M =
August 1, 2011 by Megan

Physics
Two converging lenses are separated by 23.40 cm. The focal length of each lens is 12.20 cm. An object is placed 35.00 cm to the left of the lens that is on the left. Determine the final image distance relative to the lens on the right.
March 5, 2012 by DCM

Physics
A patient has a far point of 34.6 cm and a near point of 26.0 cm. What power (in diopters) should be prescribed to give the patient normal vision for: (a) contact lenses? 1) D (b) glasses which are worn 0.9 cm away from the patient's eyes? 2) D
February 14, 2011 by DJ

physics
Two identical diverging lenses are separated by 15 cm. The focal length of each lens is -8.0 cm. An object is located 4.0 cm to the left of the lens that is on the left. Determine the final image distance relative to the lens on the right.
May 30, 2012 by matt

Physics
Two converging lenses are separated by 23.60 cm. The focal length of each lens is 12.60 cm. An object is placed 35.80 cm to the left of the lens that is on the left. Determine the final image distance relative to the lens on the right. Answer in cm
April 23, 2013 by Elizabeth

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.
July 22, 2011 by jane

Science
A scientist goes to a large international conference and hears about a new discovery. The scientist is very excited about these new findings and decides to verify the other scientists’ results by conducting her own investigations. The scientist is being open-minded but ...
October 3, 2013 by Anonymous

science
the two objects lenses on a compound microscope are attached below the
September 15, 2007 by sherod

Physics
two converging lenses placed L1=20 cm apart. the focal lengths are f1=10 cm and f2=20cm 1) where is the final image located for an object that L2=30cm infront of the first lens? 2)what is the total magnification of the lens system? *diagram* {Object}|--l2--|{lens1 = f1}|--L1...
April 27, 2010 by Jojo

7th grade
I HAVE A HOMEWORK INFORMATION OF CONTACT LENSES PROBLEMS OR INFECTIONS
November 14, 2009 by KARLA

college physics
A reflecting telescope has a radius of curvature of 3m for its objective mirror and a radius of curvature of -1.5 for its eyepiece mirror. If the distance between the two mirrors is 0.90 m, how far in front of the eyepiece should you place the electronic sensor to record the ...
April 15, 2014 by Anonymous

physics
A person sees clearly wearing eyeglasses that have a power of −2.92 diopters and sit 2.22 cm in front of the eyes. If the person wants to switch to contact lenses, which are placed directly on the eyes,what lens power should be prescribed? Answer in units of diopter.
March 21, 2011 by Jim

Physics
A student is reading a lecture written on a blackboard. The lenses in her eyes have a refractive power of 59.82 diopters, and the lens-to-retina distance is 1.686 cm. (a) How far is the blackboard from her eyes? (b) If the writing on the blackboard is 4.81 cm high, what is the...
March 24, 2013 by please help

physics
Camera lenses are described in terms of their focal length. A 50 mm lens has a focal length of 50 mm. A camera is focused on an object 81 m away using a 88 mm lens. Locate the position of the image. Answer in units of mm
March 22, 2012 by amanda and leah

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?
March 22, 2009 by John

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