A plano-convex lens ( 
) is silvered at plane surface. Now, focal length of a plano-convex lens will be:
Text Solution
Verified by ExpertsThe correct answer is:
D
The focal length of the plano-convex lens is 20 cm with the plane surface being silvered.
So, the net power of the lens is given by 
.
Thus, the net focal length is, 
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