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1057_Physics ProblemsTechnical Physics

1057_Physics ProblemsTechnical Physics - 398 Interference...

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398 Interference of Light Waves To go through 200 bright fringes, the change in thickness of the air film must be: 200 2 100 λ λ F H G I K J = . Thus, the increase in the length of the rod is L = = × = × 100 100 5 00 10 5 00 10 7 5 λ . . m m e j . From L L t i = α we have: α = = × ° = × ° L L T i 5 00 10 0 100 25 0 20 0 10 5 6 1 . . . . m m C C a fa f . P37.50 Since 1 1 25 1 34 < < . . , light reflected from top and bottom surfaces of the oil undergoes phase reversal. The path difference is then 2 t , which must be equal to m m n n λ λ = for maximum reflection, with m = 1 for the given first-order condition and n = 1 25 . . So t m n = = = λ 2 1 500 2 1 25 200 nm nm a f a f . . The volume we assume to be constant: 1 00 200 . m nm 3 = a f A A = = × = 1 00 200 10 5 00 10 5 00 9 6 . . . m m m km 3 2 2 e j . P37.51 One radio wave reaches the receiver R directly from the distant source at an angle θ above the horizontal. The other wave undergoes phase reversal as it reflects from the water at
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