A thin double convex lens has radii of curvature each of magnitude 40 – McqOptions

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1.	A thin double convex lens has radii of curvature each of magnitude 40 cm and is made of glass with refractive index 1.65. Its focal length is nearly [MP PMT 1997]
A.	20 cm
B.	31 cm
C.	35 cm
D.	50 cm
Answer» C. 35 cm

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