Question

The interference pattern on a screen 1.94 behind an 800 line/mm diffraction grating. The first maximum is 69.7 cm away from the center.

a. Find λ.

b. How many bright fringes can we see?

c. If you used small angle approximation to a.? Provide your answer as a percentage.

Answer #1

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Monochromatic light of wavelength λ1 is sent
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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
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A
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