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Help? :( The diagram shows rays of light from a point source, P, that reach a detector, D, along two paths. One path is a straight line, while the other is bent by reflection off a mirror. What is the value of b, correct to one decimal place? Assume that all the points in the diagram lie in the same plane.
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5.4 4.2 3.6 2.8
Which law are you going to use? Law of cosines or Law of sines?
I got the answer for this one but would you care to help with another?
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Close this question and post another I'll help if I can show you how
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