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

A transparent sphere of radius R and refractive index n is kept in Air

1.	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
Answer» Correct option is D)R/n – 1