A concave mirror of focal length 'fi' 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

Question:

A concave mirror of focal length ‘fi’ 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

Options :

(a) f1+f2
(b) -f1+f2
(c) 2f1+f2
(d) -f1+f2

Answer :

Answer Steps :

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