A concave spherical surface of radius of curvature `R = 20 cm` separates two media A and B having refractive indices `mu_(A) =(4

A concave spherical surface of radius of curvature `R = 20 cm` separates two media A and B having refractive indices `mu_(A) =(4)/(3)` and `mu_(B) =(3)/(2)`respectively. A point object is placed on the principal axis. Find the distance of the object from the surface so that its image is virtual when
(a) the object is in medium A.
(b) the object is in medium B.

A concave spherical surface of radius of curvature `R = 20 cm` separates two media A and B having refractive indices `mu_(A) =(4)/(3)` and `mu_(B) =(3

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