A ray of light incident on an equilateral triangular glass prism of `mu = sqrt(3)` moves parallel to the base of the prism inside it. What is the angle of incidence for this ray ?
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When refracted ray is parallel to the bas eof the prism, deviation is minimum. `:. r = A//2 = 60//2 = 30^(@)` From `mu = (sin i)/(sin r)` `sin I = mu sin r = sqrt(3) sin 30^(@) = sqrt(3)//2` `:. I = 60^(@)`
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