A point object is kept near a plane mirror. The mirror starts moving away from the object with a speed of $4 c m / s$ . The velocity of the image is

8 c m / s, t o w a r d s t h e o b j e c t

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8 c m / s, a w a y f r o m t h e o b j e c t

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4 c m / s, t o w a r d s t h e o b j e c t

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4 c m / s, a w a y f r o m t h e o b j e c t

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Solution

The correct option is B $8 c m / s, a w a y f r o m t h e o b j e c t$
We know, the velocity of the image is twice in magnitude as that of the mirror and in the same direction.
Mathematically,
$_{i} = 2_{m} W e h a v e,_{m} = 4 c m / s, a w a y f r o m t h e o b j e c t . H e n c e,_{i} = 8 c m / s, a w a y f r o m t h e o b j e c t .$

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