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ct_waveoptics - E 4 d Diffraction grating two colors A...

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Sources in phase Two light sources, A and B, emit waves of wavelength 20 cm that are in phase. The two waves from these sources meet at a distant point P. The wave from point A traveled 50 cm to reach point P, and the wave from point B traveled 90 cm. When the waves meet, they are A. out of phase by 180 . B. out of phase by 90 . C. out of phase by some other amount. D. in phase.
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Interference wavelengths Violet light of wavelength λ passes through two narrow slits separated by d , forming an interference pattern on a distant screen. If the violet light is replaced by red light of wavelength 2 λ , the original interference pattern is reproduced if the slit width is changed to A. d/ 4 . B. d/ 2 . C. d (unchanged). D. 2 d
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Unformatted text preview: . E. 4 d . Diffraction grating, two colors A diffraction grating is illuminated with yellow light at normal incidence. The pattern seen on a screen behind the grating consists of three yellow spots, one at ◦ and one each at ± 45 ◦ . You now add red light of equal intensity, also normally incident. The new pattern consists of A. red spots at ◦ and ± 45 ◦ . B. yellow spots at ◦ and ± 45 ◦ . C. orange spots at ◦ and ± 45 ◦ . D. an orange spot at ◦ , yellow spots at ± 45 ◦ , and red spots slightly closer in. E. an orange spot at ◦ , yellow spots at ± 45 ◦ , and red spots slightly farther out....
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