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There is an equiconvex glass lens with radius of each face as R and aUg = 3/2 aUw and = 4/3. If there is water in object space

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There is an equiconvex glass lens with radius of each face as R and  aUg = 3/2  aUw and = 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)  R2

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Correct option  (c)  3 R/2

Explanation :

1/f = (μ - 1)(1/R1 - 1/R2)

1/f = n2 - n1/R1 + n3 - n2/R2

f = 3R/2

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