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For minimum deviation delta(m) , assumin...

For minimum deviation `delta_(m)` , assuming that angle of incidence = angle of emergent, show that the refractive index of the material of the prism is `mu = (sin""(A + delta_(m))/(2))/(sin""(A)/(2))`
Or, Show the ray diagram of a ray of light through a thick another face. Show that `delta = i _1 + i_2 - A and A = r_1 + r_2` . The symbols have their usual meaning.

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