1.

A thin lens made of glass of refractive index m = 1.5 has a focal length equal to 12 cm in air.  It is now immersed in water \[\left( \mu \,=\,\frac{4}{3} \right)\].  Its new focal length is        [UPSEAT 2002]

A.            48 cm                                      
B.            36 cm
C.            24 cm                                      
D.            12 cm
Answer» B.            36 cm


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