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Old Jul 18th 2009, 01:47 PM   #1
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Light problems

Assume that your eyes are located at the top of your 1.60 m tall body.
a) What size plance mirror would you need to see your whole body if you were standing 1 m from it?
b) How far from the floor should the bottom edge of the mirror be placed?
c) How would your answers to (a) and (b) change if you assumed your eyes were 10 cm from the top of your head?
d) How would your answers to (a) and (b) change if you were 2 m from the mirror?


I'm not sure how to start these problems. However, I suspect that you'd have to know that the angle of incidence equals the angle of reflection since that seems the most relevant thing to what we've done so far. Anyway any explanations, tips or other help will be appreciated!


I had a bit of trouble logging in here, but now I think the problem is fixed to anyone who is wondering.
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Old Jul 18th 2009, 08:16 PM   #2
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You first draw a ray diagram with the body and the mirror. Draw light ray from the tip of head to the eye reflected from mirror and than draw another light ray from bottom of the legs to the eyes reflected from the mirror. Draw also the virtual light rays and virtual images in the mirror. Then you can use similar triangle to find what you need
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