PHY7C FNT5_Refraction

PHY7C FNT5_Refraction - FNT #5 Refraction August 16, 2005...

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Refraction August 16, 2005 There is only one problem in this set of FNTs, the prism problem: Consider the prism shown below, surrounded by a clear oil. Light travels through the oil 2.5 times faster than it does through the prism material. This prism “lens” is illuminated by a light ray as shown (perpendicular to the plane of the “back” surface of the prism). a) What is the angle the ray makes with the horizontal when it exits the prism “lens”? To answer this, let us ±rst get a good picture of what we want. We know that the light travels faster in oil, so the oil has a lower refractive index. This means when we go from oil to the prism we bend toward the normal, and as we go from the prism to the oil we bend away from the normal. (These statements will all be backed up by mathematics and the working that we are going to do. I give these arguments now so that we can draw a picture that will look something like the end result) O 120 θ θ α α 1 2 1 2 The question is asking us to ±nd the value of α 2 . 1
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PHY7C FNT5_Refraction - FNT #5 Refraction August 16, 2005...

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