As shown in the diagram when the incident ray is parall... | null (Physics) | DivineJEE

JEE Mains 2026 21st January Shift 2

Physics

As shown in the diagram, when the incident ray is parallel to base of the prism, the emergent ray grazes along the second surface.

\\

\\

If refractive index of the material of prism is

\sqrt{2}

, the angle

\theta

of prism is.

60^{\circ}

75^{\circ}

90^{\circ}

45^{\circ}

Correct Answer:

\\

For grazing emergence

\\ \sin \mathrm{r}_{2}=\frac{1}{\mu}\\

By Snell's Law at incident surface

\\1 \times \frac{1}{\sqrt{2}}=\sqrt{2} \sin \mathrm{r}_{1}\\

\mathrm{r}_{1}=30\\

\mathrm{r}_{1}+\mathrm{r}_{2}=\mathrm{A}\\

\mathrm{A}=75\\

75+45+\theta=180^{\circ}\\

\theta=60^{\circ}

Select an option to instantly check whether it is correct or wrong.

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