1.

A double convex thin lens made of glass (refractive index  \[\mu \] = 1.5) has both radii of curvature of magnitude 20 cm. Incident light rays parallel to the axis of the lens will converge at a distance L such that [MNR 1991; MP PET 1996; UPSEAT 2000; Pb PET 2004]

A.            L = 20 cm                                
B.            L = 10 cm
C.            L = 40 cm                                
D.            L = 20 / 3 cm
Answer» B.            L = 10 cm


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