hw5_solution

hw5_solution - Physics 3C Webassign Homework 5 Solutions:...

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Physics 3C Webassign Homework 5 Solutions: a. Geometry: L = 1.35m = d sin( θ ) => d = (1.35m)/sin(42) = 2.02m b. After hitting Mirror 1, the light is moving at 90-42 = 48 degrees from horizontal This means that the light hits mirror 2 with an angle of 180-90-48 = 42 degrees from vertical. This is 90-42 = 48 degrees relative to horizontal – parallel to the incident beam. The incident light reaches the left-hand mirror at a distance (2.1m)tan(5) = 0.184m above its bottom edge. The reflected light firs reaches the right-hand mirror at a height of 2(0.184m) = 0.368 above the bottom edge. It keeps doing this until it reaches a height above 1.7m. So we have 0.184m (left), 0.368m (right), 0.552 (left), 0.736 (right), 0.92 (left), 1.104 (right), 1.288 (left), 1.472 (right), 1.656 (left), and then above 1.8. That means four times on the right and five times on the left.
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Working relative to vertical, the angle observed underwater is
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hw5_solution - Physics 3C Webassign Homework 5 Solutions:...

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