21-22 A beam of light is incident from air on the surface of a liquid. If the angle of incidence is 30.5° and the angle of refraction is 18.9°, find the critical angle for the liquid when surrounded by air. °?

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21-22
A beam of light is incident from air on the surface of a liquid. If the angle of incidence is 30.5°
and the angle of refraction is 18.9°, find the critical angle for the liquid when surrounded by
air.
°?
Transcribed Image Text:21-22 A beam of light is incident from air on the surface of a liquid. If the angle of incidence is 30.5° and the angle of refraction is 18.9°, find the critical angle for the liquid when surrounded by air. °?
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