1.

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» 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)`


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