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  4. Total internal reflection of a light ray travelling from denser medium to rare medium occurs only when angle of incidence is

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Q. Total internal reflection of a light ray travelling from denser medium to rare medium occurs only when angle of incidence is

Ray Optics and Optical Instruments

Solution:

When the angle of incidence is more than a certain value the angle of refraction becomes more than $90^{\circ}$. It result into total internal reflection (critical angle).