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

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

(a) Determine the wavelength of the incident light.

(b) A second laser of wavelength λ2 is added, and it is observed that the third principal maximum of λ2 is at the same location on the screen as the fourth principal maximum of λ1. What is the wavelength λ2?

Expert Solution

a) wavelngth of incident light can be find using below formula

b)wavelength of second laser can be find using below formula

genius_generous answered 2 years ago

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