1. 180^° 2. 0^° 3. equal to angle of incidence 4. 90^°

Answer: 4. 90^° At the critical angle C , Snell's law gives μ₁sin C=μ₂sin r with sin C=μ₂/μ₁ . So sin r=1 and r=90^° : the refracted ray grazes the interface.

Topic: Total internal reflection and applications· Optics

In total internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be angle of refraction ?

1. \(180^\circ\)

2. \(0^\circ\)

3. equal to angle of incidence

4. \(90^\circ\)

Doubtly Asked 30 Oct 2026 NEET UG 2019 Practice test neet Save WhatsApp Report

1 answer

Best answer

Answer: 4. \(90^\circ\)

At the critical angle \(C\), Snell's law gives \(\mu_1\sin C=\mu_2\sin r\) with \(\sin C=\mu_2/\mu_1\). So \(\sin r=1\) and \(r=90^\circ\): the refracted ray grazes the interface.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

Was this answer helpful?

In total internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be angle of refraction ?

1 answer

Your answer