Question

A ray of light while travels from denser to rarer medium undergoes total internal reflection. Derive expression for critical angle in terms of speed of light in two mediums.?
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Answer 1

Answer:

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If a ray of light is travelling from denser medium to rarer medium and if the angle of incidence is greater than critical angle, then the following takes place total internal reflection. Hope the student can simply get best ideas to move forward with no trouble of it.

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Answer 2

Answer:

Total internal reflection is the phenomenon of reflection of light into a denser medium from an interface of the denser medium and the rarer medium.

* Two essential conditions for total internal reflection:

Incident ray should travel in denser medium and refracted ray should travel in rarer medium.

Angle of incidence (i) should be greater than the critical angle for the pair of media in contact.

Relation between refractive index (μ) and critical angle (C)

When, i = c, r = 90°; Applying Snell’s law at A2, we get

μb sin c = μb sin 90° = μa × 1