Q48 / 69 · JEE Advanced 2008 (Paper 1) · Physics

Two beams of red and violet colours are made to pass separately through a prism (angle of the prism is $60^{\circ}$ ). In the position of minimum deviation, the angle of refraction will be

  • Correct answer
    A
    $30^{\circ}$ for both the colours
  • B
    greater for the violet colour
  • C
    greater for the red colour
  • D
    equal but not $30^{\circ}$ for both the colours

Solution

At minimum deviation $\left(\delta=\delta_m\right)$ : $$ r_1=r_2=\frac{A}{2}=\frac{60^{\circ}}{2}=30^{\circ} $$ (For both colours) $\therefore$ correct answer is (a).

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

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