Two lenses shown in figure. Are illuminated by a beam of parallel light from the left. Lens B is then moved slowly toward lens A. the beam emerging from lens B is

Options

A. always diverging
B. initially parallel and then diverging
C. always parallel
D. initially converging and then parallel

Answer

b.

Explanation

Initially, the object for lensB( the lens formed by lens A) is at its focus, so rays are parallel.
As the separation between A and B decreses, the object for B is lying away from focus and hence, the rays are diverged.