Question

A real point object is kept on the pricipal axis of a concave mirror (radius of curvature `=20cm`) at a distance 60 cm from the pole. Take pole as origin and direction of incident light as positive direction of X axis. Y axis is perpendicular to the principal axis. Select correct statement(s).
A. If velocity of object `t=1hati` and velocity of mirror `=0` then velocity of image will be `-(1)/(25)hati`
B. If velocity of object `=1hatj` velocity of mirror `=0` then velocity of image will be `-(1)/(5)hatj`
C. if velocity of object `=0` and velocity of mirror `=1hati` then velocity of image will be `(1)/(25)hati`
D. if velocity of object `=0` ad velocity of mirror `=1hatj` then velocity of image will be `(1)/(5)hatj`

Answer 1

Correct Answer - A::B
`(V_(I//m))^(y)=-m^(2)(V_(0//m))`
`(V_(I//m))^(y)=m(V_(0//m))`
`m=(f)/(f-u)`
`=(-10)/(-10+60)=-(1)/(5)`