Q115 / 160 · JIPMER 2004 · Physics

A this glass prism $(\mu=1.5)$ in the position of minimum deviation deviates the monochromatic light ray by $10^{\circ}$, the refracting angle of prism is

  • Correct answer
    A
    $20^{\circ}$
  • B
    $10^{\circ}$
  • C
    $30^{\circ}$
  • D
    $45^{\circ}$

Solution

Given : $\delta_m=10^{\circ}, \mu=1.5$ For a thin prism of minimum deviation $\delta_m=(\mu-1) \mathrm{A}$ $10^{\circ}=(1.5-1) \mathrm{A}$ or $A=\frac{10}{0.5}=20^{\circ}$

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

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