Practice Problems Internal Reflection and Dispersion

Directions: On this worksheet you will examine several situations dealing with the behavior of different frequencies of light as they pass through transparent media.

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Question 1  In a physics olympics event, a semicircular plastic prism is used to direct light to a distant target on the wall. The prism has an index of refraction of n = 1.45 for red light and an index of refraction of n = 1.59 for green light. If a red beam strikes a streen L = 1.25 meters away at a position y = 0.15 meters above the central line, at what angle did the beam originally enter the prism?
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Question 2  The beam of red light is now replaced by a beam of green light. If the green beam is aimed at the prism with the same entry angle as in Question #1, it will emerge
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Question 3  A light ray enters a rectangular piece of glass along the path shown in the following diagram. If q1 = 25º and q2 = 60º at point A, then determine which of the following options will occur when the beam strikes point B.

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Question 4  When surrounded by air, a beam of blue light normal to the hypotenuse of a 45-45-90 prism in internally reflected so as to bounce back out in the reverse direction from which it entered. What is the index of refraction of the material composing the prism?

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Question 5  If the prism in Question #4 were to be submerged in a liquid having an index of n = 1.35, what would happen when the beam arrives at the first diagonal interface?