Physics · Optics - Total Internal Reflection
A parallel beam of light enters normally from air into the side PR of a right-angled triangular prism PQR (right-angled at Q). The prism has a refractive index of n = 2. The light undergoes total internal reflection at face QR such that the emerging ray grazes the side PQ. What is the angle of the prism at vertex P?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 115°
- 260°
- 345°
- 430°✓
Correct answer
30°
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