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The critical angle for total internal reflection occurs when:___________.
a) the incident ray has an angle of 90 degrees
b) the refracted ray has an angle of 90 degrees
c) both incident and refracted rays have an angle of 90 degrees

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Answer:

b) the refracted ray has an angle of 90 degrees

Explanation:

The angle of incidence is measured with respect to the normal separation of the media. The critical angle for total internal reflection occurs is:

[tex]\theta=arcsin(\frac{n_2}{n_1})[/tex]

Here [tex]n_2[/tex] and [tex]n_1[/tex] are the refractive index of the mediums. This equation is an application of Snell's law, for the case where  the refracted ray has an angle of [tex]90^\circ[/tex].

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