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

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

Ray Optics and Optical Instruments

Solution:

$A=\delta_{m}=60^{\circ}$
At minimum deviation $i=\left(\frac{A+\delta_{m}}{2}\right)=60^{\circ}$