For an equilateral prism, the angle of incidence at miniμm deviation is 45°. The refractive index is:
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Question

For an equilateral prism, the angle of incidence at miniμm deviation is 45°. The refractive index is:

G1 Physics · Accepted Answer

At miniμm deviation r=A/2=30°. Thus μ=sin45°/sin30°=√2.