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The interference pattern on a screen 1.94 behind an 800 line/mm diffraction grating. The first maximum...

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.

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