Internal Reflection and Dispersion
On this worksheet you will examine several situations dealing with properties of the refraction of light.
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 = 1.43 for red light and an index of refraction of n = 1.57 for green light. If a red beam strikes a streen L = 1.31 meters away at a position y = 0.21 meters above the central line, at what angle did the beam originally enter the prism?
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
, it will emerge
at a vertical position closer to the central line than the red beam
at the same vertical position as the red beam
at a vertical position farther from the central line than the red beam
A light ray enters a rectangular piece of glass along the path shown in the following diagram. If
= 31º and
= 54º at point A, then determine which of the following options will occur when the beam strikes point B.
the ray is refracted back into the air at an angle of 43º
the ray is internally reflected at an angle of 36º
the ray is internally reflected at an angle of 54º
the ray is refracted back into the air at an angle of 59º
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?
If the prism in
were to be submerged in a liquid having an index of n = 1.33, what would happen when the beam arrives at the first diagonal interface?
it would escape out into the liquid at an angle of 70.1º to the normal
it would escape out into the liquid at an angle of 48.8º to the normal
it would escape out into the liquid at an angle of 41.2º to the normal
it would continue to be internally reflected at an angle of 45º
it would travel in a completely vertical path, escaping out into the liquid at an angle of 45º
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Catharine H. Colwell
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