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Calculate the speed of light in …

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Calculate the speed of light in a medium whose critical angle is 45 . Does critical angle for a given pair of media depends on the wave length of incident light? Give reason

Posted by Priyanka Choudhary 8 years ago

CBSE > Class 12 > Physics

1 answers

Sunaina Gupta 8 years ago

n= 1/sinC = 1/sin45° = √2 Therefore speed of light in vaccum = speed of light in air/n = 3×10^8/1.414 = 2.121×10^8 m/s The critical angle depends on the index of refraction. The index of refraction can depend on the wavelength (color) of the light; this phenomenon is called dispersion. So yes, in a material with dispersion, the critical angle can depend on color.

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