Q4 of 29 Page 109

The absolute refractive index of water is 4/3. What is the critical angle? (AS1)

Given;

Absolute refractive index of water (n) =


By Snell’s Law critical angle(c) is given by = (sin


inverse of )


⇒ c =


⇒ c =


∴ c = 48.5o. (y looking in sine table).


Hence the critical angle is or 48.5o.


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