Grating
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When a grating is used with light that has a wavelength of 621 nm, a third-order maximum is formed at an angle of 18.0°. How many lines per centimeter does this grating have?
answer in lines/cm
https://brainmass.com/physics/grating/grating-17873
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A principal maximum is formed when the path difference between rays from adjacent slits = d Sin theta is given ...
Solution Summary
The solution calculates lines per centimeter for a grating.
$2.49