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Suppose light from a 632.8 nm helium-neon laser shines through a diffraction grating ruled at 520 lines/mm. How many bright lines are formed
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Answers ( )
Answer:
1 bright fringe every 33 cm.
Explanation:
The formula to calculate the position of the m-th order brigh line (constructive interference) produced by diffraction of light through a diffraction grating is:
where
m is the order of the maximum
D is the distance of the screen
d is the separation between two adjacent slit
Here we have:
D = 1 m is the distance of the screen (not given in the problem, so we assume it to be 1 meter)
Therefore, substituting m = 1, we find:
So, on the distant screen, there is 1 bright fringe every 33 cm.