A concave mirror of focal length ' 
' is placed at a distance of ' d ' from a convex lens of focal length ' 
'. A beam of light coming from infinity and falling on this convex lens-concave mirror combination returns to infinity. The distance ' d ' must equal
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Focus of convex lens must coincide with center of curuature of concave mirror, then only light rays will retrace its path.
So, 
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