The refractive index of a glass is $1.520$ for red light and $1.525$ for blue light. Let ${D_1}$ and ${D_2}$ be angles of minimum deviation for red and blue light respectively in a prism of this glass. Then,
${D_1} < {D_2}$
${D_1} = {D_2}$
${D_1}$ can be less than or greater than ${D_2}$ depending upon the angle of prism
${D_1} > {D_2}$
Solution
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