A plano convex lens \[(f=20cm)\]is silvered at plane surface. Now f wi – McqOptions

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1.	A plano convex lens \[(f=20cm)\]is silvered at plane surface. Now f will be [BHU 1995; DPMT 2001; MP PMT 2005]
A.	20 cm
B.	40 cm
C.	30 cm
D.	10 cm
Answer» E.

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