13.The angle of a prism of refractive index 1.5 is 60 degree .What will be the angle of minimum deviation of the prism (sin 49degree =0.75) .
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Angle of minimum deviation δm and angle of prism A are related as Glass prism of refractive index 1.5 is immersed in a liquid of refractive index 1.3 so the relative refractive index of the prism decreasesµ = 1.5/1.3 = 1.115So as per above equation as A is constant for a prism as µ decreases δm also decreases.
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