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In glass, which end of the visible spectrum has the smallest criti- cal angle for total internal reflection?

In glass, which end of the visible spectrum has the smallest criti- cal angle for total internal reflection?

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In glass, which end of the visible spectrum has the smallest criti- cal angle for total internal reflection?
Transcribed Image Text:In glass, which end of the visible spectrum has the smallest criti- cal angle for total internal reflection?
Expert Solution
Introduction:
  • Refraction is the bending of light in an optically dense medium when it enters from an optically thin medium.

 

  • Sometimes when light enters a medium instead of passing through it gets completely reflected inside the medium. This is known as total internal reflection. The angle of refraction becomes 90o when this happens.

 

  • The incidence angle at which the angle of refraction becomes 90o is called the critical angle. It is given by,

θC=sin−1(μrμd)

Here µd is the refractive index of the denser medium and µr is the refractive index of the rarer medium.

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