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Q.

Refraction takes place at a concave spherical boundary separating glass air medium. For the image to be real, the object distance μg=3/2

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a

should be greater than three times the radius of curvature of the refracting surface

b

should be greater than two times the radius of curvature of the refracting surface

c

should be greater than the radius of curvature of the refracting surface

d

is independent of the radius of curvature of the refracting surface

answer is A.

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Detailed Solution

Applying μ2v−μ1u=μ2−μ1R1v-1.5−u=1−1.5−R   or  1v+32u=12Rfor  v  to  be  positive  12R>32uor  u>3R
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