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Question

A boy runs towards a convex mirror with a speed v. His image is seen to move towards the mirror at a speed v'. Then,
  1. v < v'
  2. v > v'
  3. v = v'
  4. Nothing can be said as data are indufficient

A
v < v'
B
Nothing can be said as data are indufficient
C
v > v'
D
v = v'
Solution
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Answer is B.

In a convex mirror, the image distance is smaller than the object distance. That is, when an object moves towards the convex mirror, the image appears to move closer at a faster rate.
Hence, the speed of the approaching object is faster than the speed of the approaching image. That is, v>v.
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