Q5 of 29 Page 109

Determine the refractive index of benzene if the critical angels 42°. (AS1)

Given;

Critical angle (c) = 42o .


By Snell’s Law;


Refractive index(n) =


⇒ n =


⇒ n = (By looking in sine table sin42 = 0.6691).


Hence refractive index of benzene is 1.51


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