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White light is incident upon a diffraction grating with 1200 lines per mm. What is the...

White light is incident upon a diffraction grating with 1200 lines per mm. What is the angle between the red light (700 nm) and green light (550 nm) leaving the grating in the first order bright fringe?

a.

32.8 degrees

b.

24.5 degrees

c.

57.2 degrees

d.

15.9 degrees

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