1.

A thin plano-convex lens is placed on a plane mirror as shown in the figure. The radius of curvature of curved surface is 40 cm. the refractive index of material of lens `n_(1)=1.5`. The refractive index surrounding is `n_(0)=1.2` An object O starts moving parallel to plane mirror. if final image of object moves with same speed as that of the object initially then distance of object O from the plane mirror is.A. 80 cmB. 120 cmC. 160 cmD. none of these

Answer» Correct Answer - C
Since `m=-1` so distance of object from mirror should be `2f_(eq)`
`(-1)/(f_(eq))=((n)/(n_(0))-1)(2)/(R)`
`f_(eq)=80cm`


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