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Sahay Sir > Question Answers > NCERT Exemplar Class 12 > Physics > Chapter 9 - Ray Optics and Optical Instruments > You are given prism made of crown glass and flint glass with a wide variety of angles. Suggest a combination of prism which will (i) deviate a pencil of white light without much dispersion. (ii) disperse and displace a pencil of white light without much deviation.

You are given prism made of crown glass and flint glass with a wide variety of angles. Suggest a combination of prism which will (i) deviate a pencil of white light without much dispersion. (ii) disperse and displace a pencil of white light without much deviation.

A screen is placed 90 cm from an object. The image an object on the screen is formed by a convex lens two different locations separated by 20 cm. Determine the focal length of the lens is