Physics
posted by Roby .
Light of wavelength 600 nm illuminates a diffraction grating. The secondorder maximum is at angle 39.1°.
How many lines per millimeter does this grating have?

Physics 
drwls
Strictly speaking, it depends upon the angle of incidence. Assume it is zero degrees (normal).
Then use the grating equation. Let d be the groove spacing.
n*(lambda) = d sin(theta)
In your case,
lamda (the wavelength) = 600*10^9 m
n = 2
sin(theta) = 0.6307
Solve for d in meters.
Lines per mm = 1000/d(meters)
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