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Old Dec 14th 2009, 07:52 AM   #1
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Problem with mirrors

A small lamp suspended 250 cm above the water surface of a pool. The water depth is 200cm and the bottom of the pool is a large mirror. Where is the image of the lamp?
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Old Mar 12th 2010, 12:18 AM   #2
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Originally Posted by viciado View Post
A small lamp suspended 250 cm above the water surface of a pool. The water depth is 200cm and the bottom of the pool is a large mirror. Where is the image of the lamp?
The mirror sees the surface of the water at a distance 200*4/3 cm. So the apparent distance of the lamp from the mirror is (200*4/3 + 250) cm. Then the image distance is ........?
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