Q. A concave mirror of focal length ‘$f_{1}$’ is placed at a distance of ‘$d$’ from a convex lens of focal length ‘$f_{2}$’. A beam of light coming from infinity and falling on this convex lens-concave mirror combination returns to infinity. The distance ‘$d$’ must equal
A) $f_{1} + f_{2}$
B) $- f_{2} + f_{2}$
C) $2f_{1} + f_{2}$
D) $- 2f_{1} + f_{2}$
Explanation
The correct answer is Option C: $2f_{1} + f_{2}$.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.