Q.No.109: - When
total internal reflection occurs?
Ans: - When a ray
passes from two media of different refractive index. Then the medium of
incoming ray must have greater refractive index than the other i.e. the medium
must be denser of incoming ray. Similarly the wave speed and wavelength of
incoming ray must be smaller or shorter. Furthermore total internal reflection
will occur if the angle of incident is larger than or equal to critical angle.
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