The refractive index of glass is $1.520$ for red light and $1.525$ for blue light. Let $D_1$ and $D_2$ be an of minimum deviation for red and blue light respectively in a prism of this glass. Then

• A

  $D_1>D_2$
• Correct answer
  B

  $\mathrm{D}_1 < \mathrm{D}_2$
• C

  $D_1=D_2$
• D

  $D_1$ can be less than or greater than depending upon the angle of prism

Hence, the correct answer is option: 'B'.