Please solve the query below. Thank you
Q.(b) The refractive index of air with respect to glass is, g μ α = sin   i sin   r
(i) Write the expression for α μ g in terms of angles i and r.
(ii) In (i) above, if angle r = 90 ° , what is the corresponding angle i called.
(iii) What is the physical significance of angle i in part (ii) above?

Dear student,
(i) It will be the reciprocal, 

μga = sinrsini

(ii) Critical angle

(iii) If the angle of incidence is more than the critical angle, total internal reflection occurs and the ray returns to the same medium. Formation of mirage in the deserts is due to total internal reflection.

Regards

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ii) critical angle iii) total internal reflection(phenomenon responsible for rainbow formation)
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