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Physics 8 Online
OpenStudy (anonymous):

Dealing with interference... why is the small-angle approximation good enough for the double-slit pattern but not for the pattern of the diffraction grating?

OpenStudy (anonymous):

well.. grating causes large angles... the usual rule is.. if angle is less than 10 degrees.. then sin theta = theta.. (in radians though)..

OpenStudy (masumanwar):

the angle θ is quite small

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