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Monochromatic light of wavelength λ1 is sent through two closely-spaced slits separated by a distance d1...

Monochromatic light of wavelength λ1 is sent through two closely-spaced slits separated by a distance d1 = 1.8 mm. A resulting interference pattern is shown on a screen L1 away. Another monochromatic light source, this one of wavelength λ2, is sent through a diffraction grating toward the same screen, resulting in a second interference pattern. The diffraction grating is a distance L2 from the screen and has 400 lines per mm etched onto it.

A) Assume that L1 = L2 = 4.8 m and that λ1 = λ2 = λ. Which interference pattern will have a greater angular separation between its m = 1 bright fringes? Explain.

B) If the interference pattern from the double slit produces 5 bright fringes/cm, what is the wavelength λ of the light?

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