You are standing in front of a plane mirror at a distance of 10 . Now if you start walking towards the mirror, then the speed with which your image is approaching you is 2 −1. Find the time at which you will reach the mirror.
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Explanation:
So if the plane mirror is approaching the object with a speed of x/t, then the image will approach the object with a speed of 2x/t. So if x/t = 10 cm/s, 2x/t = 20 cm/s. Hence the image will approach you with a speed of 20 cm/s.
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