A concave mirror of focal length f 1 is placed at a distance of d from a convex lens of…
Physics · Class 12 · CBSE — Ray Optics & Optical Instruments
A concave mirror of focal length f1 is placed at a distance of d from a convex lens of focal length f2. A beam of light coming from infinity and falling on this convex lens – concave mirror combination returns to infinity. The distance d must equal
- f1 + f2
- –f1 + f2
- 2f1 + f2
- –2f1 + f2
Answer
(A) f 1 + f 2
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