PH-1733

Total internal reflection

Physics · Secondary 4 · Medium · Total internal reflection

A light ray in glass (refractive index 1.6) strikes the glass–air boundary at

50^\circ

to the normal. Will total internal reflection occur?

Yes, because $50^\circ$ is greater than the critical angle.
Yes, because $50^\circ$ is less than the critical angle.
No, because $50^\circ$ is greater than the critical angle.
No, because glass has higher refractive index than air.

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