A transparent sphere of radius R and ref...

A transparent sphere of radius R and refractive index n is kept in air. At what distance from the surface of the sphere should a point object be placed on the principal axis so as to from a real image at the same distance from the second surface of the sphere.

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A transparent sphere of radius R and refractive index n is kept in air. At what distance from the surface of the sphere should a point object be placed on the principal axis so as to from a real image at the same distance from the second surface of the sphere.

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