1.

The refractive index of a glass is 1.520 for red light and 1.525 for blue light. Let D1 and D2 be angles of minimum deviation for red and blue light respectively in a prism of this glass. Then,(a) D1 < D2(b) D1 = D2(c) D1 can be less than or greater than D2 depending upon the angle of prism(d) D1 > D2

Answer»

(a) For a thin prism, D = (μ – 1) A Since λb < λr ⇒ μr < μb ⇒ D1 < D2



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