Question: Q. 6. (i) Write the necessary conditions for the phenomenon of total internal reflection to occur.
(ii) Write the relation between the refractive index and critical angle for a given pair of optical media.
R [Delhi I, II, III 2013]
Solution:
Ans. Conditions for Total internal reflection are
(i) Incident ray is in denser medium.
(ii) Angle of incidence should be larger than critical angle.
$$ n_{12}=\frac{1}{\sin C} $$
Where $C$ is the critical angle.
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