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There is an equiconcave 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

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There is an equiconcave 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. 2 R
B. R
C. `3 R//2`
D. `R^(2)`
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Correct Answer - c
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