Ray Optics and Optical Instruments - Result Question 32

32. 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.

[2012] The distance ’ d ’ must equal :

(a) f1+f2

(b) f1+f2

(c) 2f1+f2

(d) 2f1+f2

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Answer:

Correct Answer: 32. (c)

Solution:

  1. (c)

d=f2+2f1



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