Physics · Optics
What is the necessary condition for total internal reflection to occur?
- 1The refractive indices of both media must be perfectly equal.
- 2Light must strike the boundary at 90° to the normal separating any two media.
- 3Light must travel from a denser to a rarer medium at an angle of incidence greater than the critical angle.✓
- 4Light must travel from a rarer medium to a denser medium at an angle of 90°.
Correct answer
Light must travel from a denser to a rarer medium at an angle of incidence greater than the critical angle.
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