A helium-neon laser produces red light with a wavelength of 633 nm. Suppose you
ID: 1469274 • Letter: A
Question
A helium-neon laser produces red light with a wavelength of 633 nm. Suppose you hold adiffraction grating in the beam, which produces several additional dots besides the main beam.You measure that the closest dots have been deflected horizontally to the left and right of the main beam at an angle of 20°.
a) What is the orientation of the ridged lines (“slits”) in the grating as you’re holding it?
(A) The grating lines were horizontal (B) The grating lines were vertical
Correct answer it's (b), but why?
b) What is the spacing between the lines of the grating?
Corecct answer: 1.85 m
Explanation / Answer
a)
(B) The grating lines were vertical
the main is in the middle
the side dots are side ways
the side dote will deflect perpendicular
as the dots deflected horizantal , the slit is vertical
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in a diffration
sintheta = wavelength/slit width
sin20 = L/a
sin20 = (633*10^-9)/a
a = 1.85 um
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