All GRE Subject Test: Physics Resources
Example Questions
Example Question #4 : Electromagnetics, Waves, And Optics
A beam of light travels through a medium with index of refraction until it reaches an interface with another material, with index of refraction . No light is transmitted into the second material. At what angle (measured from the plane of the interface between the two materials) does the beam hit the second material?
Possible Answers:
This situation is impossible.
Correct answer:
Explanation:
Total internal reflection occurs at the angle:
However, this angle is measured from a line normal to the plane of the interface; the angle we want, therefore, is , which is .
Gregory
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All GRE Subject Test: Physics Resources
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