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Laser light of some wavelength λ1 shines on a diffraction grating with 285 lines/mm at normal...

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Physics

Laser light of some wavelength λ1 shines on a diffractiongrating with 285 lines/mm at normal incidence, producing a patternof maxima on a large screen 1.50 m from the grating. The firstprincipal maximum is observed to be at an angle of 8.20° from thecentral maximum.

(a) Determine the wavelength of the incident light.

(b) A second laser of wavelength λ2 is added, and it isobserved that the third principal maximum of λ2 is at the samelocation on the screen as the fourth principal maximum of λ1. Whatis the wavelength λ2?

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4.1 Ratings (857 Votes)
a wavelngth of incident    See Answer
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