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critical angle and refractive index of a material

Sujoy Das
03/03/2018 0 0

(i) What is the relation between critical angle and refractive index of a material ?
(ii) Does critical angle depend on the colour of light ? Explain.

(i) Refractive index = 1/sin C
where C is the critical angle.
(ii) Since, refractive index depends upon the wavelength of light, the critical angle for a given pair of media is different for different wavelengths (colours) of light

Distinguish between any two types of propagation of electromagnetic waves with respect to
(i) frequency range over which they are applicable.
(ii) communication systems in which they are used.

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