994_Physics ProblemsTechnical Physics

994_Physics ProblemsTechnical Physics - Chapter 35 P35.54...

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Chapter 35 335 P35.54 Light passing the top of the pole makes an angle of incidence φθ 1 90 0 . . It falls on the water surface at distance from the pole s Ld 1 = tan θ and has an angle of refraction φ 2 from 1 00 12 .s i n s i n φφ = n . Then sd 22 = tan and the whole shadow length is ss d n 1 1 += + F H G I K J F H G I K J tan tan sin sin d n 1 1 200 40 0 40 0 133 379 + F H G I K J F H G I K J = ° + ° F H G I K J F H G I K J = tan tan sin cos . tan . .t a n s i n cos . . . m m m af FIG. P35.54 P35.55 As the beam enters the slab, 100 500 148 2 i n. i n °= giving 2 31 2 .. FIG. P35.55 The beam then strikes the top of the slab at x 1 155 31 2 = ° . tan . mm from the left end. Thereafter, the beam strikes a face each time it has traveled a distance of 2 1 x along the length of the slab. Since the slab is 420 mm long, the beam has an additional 420 1 mm x to travel after the first reflection. The number of additional reflections is 420 2 312 310 81 5 1 1 mm 420 mm mm mm = −° ° = x x a n . a n . . or 81 reflections since the answer must be an integer. The total number of reflections made in the slab is then
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .

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