1.

A plane convex lens is made of refractive index 1.6. The radius of curvature of the curved surface is 60 cm. The focal length of the lens is                                            [CBSE PMT 1999;  Pb. PMT 1999; BHU 2001; Very Similar to BHU 2003]

A.            50 cm                                      
B.            100 cm
C.            200 cm                                    
D.            400 cm
Answer» C.            200 cm                                    


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