A) plane mirror
B) convex mirror of focal length 2f
C) concave mirror of focal length \[\frac{f}{2}\]
D) None of the above
Correct Answer: C
Solution :
When plane surface of a plano-convex lens is silvered, it behaves like a concave mirror. Radius of curvature of concave mirror so formed becomes equal to focal length of plano-convex lens. \[\therefore \]f of mirror \[=\frac{1}{2}\times \] Focal length of lens Focal length of mirror \[=\frac{f}{2}\]
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