Question: A transmission grating whose lines are separated by 3.0 10 -6 m is illuminated by a narrow beam of red light (l0 = 694.3

A transmission grating whose lines are separated by 3.0 × 10^-6m is illuminated by a narrow beam of red light (l0 = 694.3 nm) from a ruby laser. Spots of diffracted light, on both sides of the undeflected beam, appear on a screen 2.0 m away. How far from the central axis is each of the two nearest spots?

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