1.

There is an equiconvex glass lens with radius of each face as R and \[_{a}{{\mu }_{g}}=3/2\] and \[_{a}{{\mu }_{w}}=4/3\]. If there is water in object space and air in image space, then the focal length is

A.            2R  
B.            R
C.            3 R/2                                        
D.            \[{{R}^{2}}\]
Answer» D.            \[{{R}^{2}}\]


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