Question
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 be equal
-
f1 +f2
-
-f1 +f2
-
2f1+f2
-
-2f1 +f2
Solution
C.
2f1+f2
d= 2f1 +f2
