Absorption, Reflection, Refraction

Write one to three sentences for each of the following words or phrases.  This is for you to check your understanding of the material, so doing cut and paste from the lesson will not help you in any way.

1. My shirt is green. Why?


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2. Discuss reflection. Include specular and diffuse reflection.


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3. Discuss absorption.


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4. Discuss refraction. Include what happens when a tiny bit of matter slows down or speeds up.





Angles of Incidence, Refraction and Deviation


5. If a ray of light travels from a fast material to a slow material at a 26 degree angle to the normal to the surface, and it is refracted through an angle of 16 degrees, by how much was it deviated?


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6. A ray of light is deviated by -9 degrees when it passes from one material to another one. If the angle of refraction is 20 degrees, what was the original angle of incidence?


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Is this ray of light going from a faster material to a slower material, or slower to faster?
faster to slower
slower to faster
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7. A ray is incident on a material at an angle of 56 degrees to the normal. If the angle of deviation is 18 degrees, what is the angle of refraction?


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Is the ray going from a faster material to a slower material, or slower to faster?
faster to slower
slower to faster

Index of Refraction

Fill in the missing items in the table. Round indices to two decimal places. Round speeds to thousands of miles per second. When you are finished, take a look at the relationship of the speeds and indices of the materials.

Look back at this table of speeds and indices. If you got all of them correct then the materials are listed in order. Tell me, in one or two sentences, about the relationship of the speed of light in the material and the index of refraction of the material, going from the top of the table to the bottom of the table.