A laser beam is traveling through an unknown substance when


A laser beam is traveling through an unknown substance. When it encounters a boundary with air, the angle of reflection is 22.4° and the angle of refraction is 40.0°.

(a) What is the index of refraction of the substance?

(b) What is the speed of light in the substance?

(c) At what minimum angle of incidence would the light be totally internally reflected?

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Physics: A laser beam is traveling through an unknown substance when
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