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# HW30 - Platt David Homework 30 Due 4:00 am Inst Ken Shih...

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Platt, David – Homework 30 – Due: Nov 21 2005, 4:00 am – Inst: Ken Shih 1 This print-out should have 9 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points Consider two ways that light might hypothet- ically get from its starting point S to its final point F by being reflected by a mirror at ei- ther point A or point B. Since light travels at a fixed speed in air, the path of the least time will also be the path of the least distance. S F A B C 44 cm 44 cm 23 cm 23 cm Show by calculation that the path SBF is shorter than the path SAF and record the difference in the path lengths. Answer in units of cm. 002 (part 1 of 2) 10 points Consider the case in which light ray A is in- cident on mirror 1 , as shown in the figure. The reflected ray is incident on mirror 2 and subsequently reflected as ray B. Let the an- gle of incidence (with respect to the normal) on mirror 1 be θ A = 41

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