An object approaches a convergent lens from the left of the lens with a uniform speed `5 m//s` and stops at the focus. The image.

Options

A. moves away from the lens with uniform speed `5 m//s`
B. moves away from the lens with uniform acceleration
C. moves away from the lens with a non-uniform acceleration
D. moves towards from the lens with a non-uniform acceleration

Answer

C

Explanation

When an object approaches a convergent lens from the left of the lens with a uniform speed of `5 m//s`, the image moves away from the lens with a non uniform acceleration. For example. If `f = 20 m` and `v = - 50 m , - 45 m` and `-35 m` , we get `v = 33.3m , 36 m , 40 m` and `46.7m`. Clearly, image moves away from the lens with a non uniform accelaration. Choice ( c) is correct.