# Under what conditions does the phenomenon of total internal reflection take place? Draw a ray diagram showing how a ray of light deviates by $90^{o}$ after passing through a right-angled isosceles prism.

The conditions for the total internal reflection are -

1. light travels from a denser medium to rarer medium

2. The angle of incidence in the denser medium must be greater than the critical angle.

• The ray diagram showing how a ray of light deviates by $90^{o}$ after passing through a right-angled isosceles prism

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