Question:
A converging lens and a diverging mirror are placed at a separation of $15 \mathrm{~cm}$. The focal length of the lens is $25 \mathrm{~cm}$ and that of the mirror is $40 \mathrm{~cm}$. Where should a point source be placed between the lens and the mirror so that the light, after getting reflected by the mirror and then getting transmitted by the lens, comes out parallel to the principal axis?
Solution:
