JEE Mains · Physics · STD 12 - 9. Ray optics and optical instruments
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.
- A 60°
- B 75°
- C 90°
- D 45°
Answer & Solution
Correct Answer
(A) 60°
Step-by-step Solution
Detailed explanation
For grazing emergence \(\sin r_2=\frac{1}{\mu}\) By Snell's Law at incident surface \(1 \times \frac{1}{\sqrt{2}}=\sqrt{2} \sin r _1\) \(r_1=30\) \(r _1+ r _2= A\) \(A=75\) \(75+45+\theta=180^{\circ}\) \(\theta=60^{\circ}\)
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