The radius of the convex surface of plano-convex lens is 20 cm and the – McqOptions

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1.	The radius of the convex surface of plano-convex lens is 20 cm and the refractive index of the material of the lens is 1.5. The focal length of the lens is [CPMT 2004]
A.	30 cm
B.	50 cm
C.	20 cm
D.	40 cm
Answer» E.

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