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An object is present on the principal ax...

An object is present on the principal axis of a concave mirror at a distance `30cm`from it.Focal length of mirror is`20cm`

If object starts moving with `2cms^(-1)`perpendicular to principal axis above the principal axis then,

A

image moves with velocity`4cms^(-1)`below the principal axis.

B

image moves with velocity`4cms^(-1)`above the principal axis.

C

image moves with velocity`8cms^(-1)`below the principal axis.

D

image moves with velocity`8cms^(-1)`above the principal axis.

Text Solution

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The correct Answer is:
A
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