Asked by Roby
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?
How many lines per millimeter does this grating have?
Answers
Answered by
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)
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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