Posted by **Roby** on Thursday, March 31, 2011 at 10:08am.

Light of wavelength 600 nm illuminates a diffraction grating. The second-order maximum is at angle 39.1°.

How many lines per millimeter does this grating have?

- Physics -
**drwls**, Thursday, March 31, 2011 at 11:03am
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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