A plane mirror is approaching you at 10 cm/s . Your image shall approach you with a speed of ?
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If x is the distance between the object and the mirror, 2x is the distance between the object and its image because for a plane mirror object distance is equal to the image distance. 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.
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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