Question

State two essential conditions of total internal reflection of light.
Write the relation between refractive index of material w, angle of prism A and
minimum deviation Om when a monochromatic ray of light passing through a
prism.
OR
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Answer 1

•State two essential conditions of total internal reflection of light.

Answer--

The two conditions for total internal reflection :

1. The ray of light must travel from a denser medium into a rarer medium.

2. The angle of incidence in the denser medium must be greater than the critical angle for that pair of media.

Critical angle is that angle of incidence in a denser medium, for which the angle of refraction in the rarer medium is 90 °.

•For the answer of second question please refer the attached image.

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