Answer to Question #18795 in Optics for Mark
The grating is made up of how many lines?
d is the line spacing. If the grating width is W and number of lines is N, then
d = W/N.
In our problem, W = 2.6 cm, lambda = 439 nm, theta = 41 deg, m = 1.
N = W/d = W*sin(theta)/(m*lambda) = (2.6 cm)*sin(41 deg)/(1*439 nm) = 38900.
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