PH-471

Total internal reflection

Physics · Secondary 3 · Hard · Total internal reflection

A ray of light travels from glass (refractive index 1.60) into air. It strikes the glass–air boundary at an angle of incidence of

40^\circ

inside the glass. Will total internal reflection occur, and why?

Yes, because $40^\circ$ is greater than the critical angle.
Yes, because $40^\circ$ is less than the critical angle.
No, because $40^\circ$ is greater than the critical angle.
No, because glass has a higher refractive index than air.

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