A ray of light suffers minimum deviation when incident on a prism having angle of the prism equal to 60 ° . The refractive index of the prism material is √(2) . The angle of incidence (in degrees) is -

Physics · Geometrical Optics

JEE Main 2025 — 2 April, Evening Shift — Question 67

A ray of light suffers minimum deviation when incident on a prism having angle of the prism equal to

$60^{\circ}$ . The refractive index of the prism material is $\sqrt{2}$ .

The angle of incidence (in degrees) is $\qquad$ -

Numerical answer — enter this value.

For minimum deviation

$r_{1}=r_{2}=\frac{A}{2}=30^{\circ}$ At $P$

$1 \times \sin i=\mu \times \sin 30$

$\sin i=\sqrt{2} \times \frac{1}{2}=\frac{1}{\sqrt{2}}$

$i=45^{\circ}$

Answer key and solution verified before publishing.

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