1056_Physics ProblemsTechnical Physics

1056_Physics ProblemsTechnical Physics - Chapter 37 P37.47...

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Chapter 37 397 P37.47 My middle finger has width d = 2 cm. (a) Two adjacent directions of constructive interference for 600-nm light are described by dm sin sin θλ θ = = ×= × −− 0 2 1 7 0 21 0 1 61 0 m m ej Thus, 1 3 0 degree and θθ 10 3 10 ~ d e g r e e . (b) Choose 1 20 0 2 0 1 7 2 ×° = = m mm af sin λ Millimeter waves are microwaves . f c = : f = × × 31 0 71 0 10 8 3 11 ms m Hz ~ P37.48 If the center point on the screen is to be a dark spot rather than bright, passage through the plastic must delay the light by one-half wavelength. Calling the thickness of the plastic t. tt n nt λλ += = 1 2 or t n = where n is the index of refraction for the plastic. P37.49 No phase shift upon reflection from the upper surface (glass to air) of the film, but there will be a shift of 2 due to the reflection at the lower surface of the film (air to metal). The total phase
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