A transparent sphere of radius R and refractive index n is kept in Air.At what distance from the surface of the sphere

Monjur Alahi

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 form a real image at the same distance from the second surface of the sphere? 

A) \(\frac{n\,-\,1}{R}\)

B) (n – 1).R 

C)R+(n – 1) 

D)R/n – 1


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Salim Ahmed Kawsar

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Correct option is  D)R/n – 1

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