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Homework Statement
If a green laser is (wavelength = 532nm) sent through two slits with a separation of 127 um, how wide (in total) would the 11 green dots formed be if they were projected onto a screen 1.25m away from the slits?
Refer to this diagram sorry for bad quality: https://imgur.com/a/ACcJYJd
Homework Equations
mλ=dsinθ
tanθ = Y/L
The Attempt at a Solution
First find θ
sinθ = mλ/d
sinθ = [(5)(5.32x10^9)] / 1.27x10^6
sinθ = 2.09x10^2
θ = 1.2 degrees
second, find distance from m = 0 to m = 5 (Y)
tanθ = Y/L
Y = Ltanθ
Y = 1.25tan(1.2)
Y = 2.61x10^2m
So therefore, the total distance of the 11 dots will be twice the distance between M=0 and M=5
Total width of 11 dots = (2.61x10^2) x 2 = 5.24x10^2m
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