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  4. A ray of light passes through an equilateral glass prism in such a manner that the angle of incidence is equal to the angle of emergence and each of these angles is equal to (3/4) of the angle of the prism. The angle of deviation is

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Q. A ray of light passes through an equilateral glass prism in such a manner that the angle of incidence is equal to the angle of emergence and each of these angles is equal to $\frac{3}{4}$ of the angle of the prism. The angle of deviation is

KCETKCET 2022Ray Optics and Optical Instruments

Solution:

$i _{1}+ i _{2}- A = D$