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Question

# A real object is placed infront of a convex mirror (focal length f). It moves towards the mirror, the image also moves. If Vi= speed of image and V0= speed of the object and u is the distance of object from mirror along principal axis, then

A
Vi<V0 if |u| < |f|
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B
Vi>V0 if |u| > |f|
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C
Vi<V0 if |u| > |f|
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D
Vi=V0 if |u| = |f|
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Solution

## The correct options are B Vi<V0 if |u| < |f| C Vi<V0 if |u| > |f|u=−u ;f=+f1v+1u=1f1v+−1u=1fv=fuu+f∂v∂t=∂fuu+f∂tvi=vo×f2(u+f)2fu+f<1vi<v0 alwaysoption A,C is correct

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