How do I find the spacing(d) of a grating in a diffraction grating experiment.

AI Thread Summary
To find the spacing (d) of a diffraction grating, the equation dsin∅ = nλ is used, where n is the order of the maxima and λ is the wavelength. The user initially calculated the angle as 26 degrees but realized the correct angle for the calculation should be 13 degrees, corresponding to the second-order maxima on either side of the central maximum. This discrepancy led to an answer that was half of what it should be. Understanding which angle to use is crucial for accurate calculations in diffraction experiments. Clarifying the definition of angle ∅ is essential for solving the problem correctly.
mutineer123
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Homework Statement



http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9702%20-%20Physics/9702_s02_qp_2.pdf

question no. 7b





Homework Equations



dsin∅=nλ





The Attempt at a Solution



I subtracted the two angles and got 26 degrees. So then I plugged it all into the equation:
dsin26=2 X 630x10^-9.
My answer is half the actual answer because the angle the answer sheet has is 13 degree. Why do they take it as 13 degree??
 
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Look at the figure. The two angles correspond to the second-order maxima at both sides of the central maximum.
You need to know what angle is called ∅. ehild
 
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