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Sahay Sir > Question Answers > Cengage JEE Mains Physics by B.M Sharma > Chapter 26 - Geometrical Optics > A parallel beam of light is incident on the system of two convex lenses of focal lengths f1 ​= 20 cm and f2 ​= 10 cm. What should be the distance between the two lenses so that rays after refraction from both the lenses pass undeviated.

A parallel beam of light is incident on the system of two convex lenses of focal lengths f1 ​= 20 cm and f2 ​= 10 cm. What should be the distance between the two lenses so that rays after refraction from both the lenses pass undeviated.

Angle of minimum deviation is equal to the angle of prism A of an equilateral glass prism. The angle of incident at which minimum deviation will be obtained is