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 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 75 .. m m ej . From ∆∆ LL t i = α we have: × ° ° L LT i 500 10 0100 250 20 0 10 5 61 . . m mC C af a f . P37.50 Since 11 2 51 3 4 << , 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 = for maximum reflection, with m = 1 for the given first-order condition and n = 125 . . So t m n = 2 1500 2125 200 nm nm a f . . The volume we assume to be constant: 100 200 . m n m 3 = A A × = 200 10 500 9 6 . m m k m 3 22 . 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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