Geometrical OpticsHard
Question
A plano-convex lens has focal f = 20 cm. If its plane surface is silvered, then the new focal length will be :-
Options
A.10 cm
B.15 cm
C.20 cm
D.25 cm
Solution
A plano-convex lens with its silvered plane surface behaves like a concave mirror of focal length
or F = 10 cm
or F = 10 cm
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