Physics · Ray Optics
If a ray of light in a denser medium strikes a rarer medium at an angle of incidence i, the angles of reflection and refraction are r and r' respectively. If the reflected and refracted rays are at right angles to each other, the critical angle for the given pair of media is:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1cot-1(tan i)
- 2tan-1(sin i)
- 3sin-1(tan r)✓
- 4sin-1(tan r')
Correct answer
sin-1(tan r)
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