A plane mirror is approaching you at a speed of 10 cm/sec. You can see your image in it. At what speed will your image approach you
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a
10 cm/sec
b
5 cm/sec
c
20 cm/sec
d
15 cm/sec
answer is C.
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Detailed Solution
Suppose at any instant, plane mirror lies at a distance x from object. Image will be formed behind the mirror at the same distance x.When the mirror shifts towards the object by distance r''the image shifts : 2ySo speed of image = 2 , speed of mirror