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Q.

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 falling on this convex lens – concave mirror combination returns to infinity. The distance d must equal:

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a

-f1 + f2

b

f1 + f2

c

-2f1 + f2

d

2f1 + f2

answer is C.

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d = f2 + 2f1

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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 falling on this convex lens – concave mirror combination returns to infinity. The distance d must equal: