You have a laser and want to estimate the wavelength. You decide to use a reflective diffraction grating to do this. The light is incident on the grating at 20 degrees with respect to normal. Using a grating with a groove distance of 5 mm, the first-order diffraction, is found at an angle of-12.5 degrees. Determine the wavelength of the source.
We can use Grating equation to calculate wavelength of light
source. m = d
(sin
i+
sin
r) .
Where m is order of diffraction,
i is
incident angle and
r is
diffracted angle.
m =1, i =
20°,
r =
-12.5° and d =5 mm = 5×10-3m
1× =
5×10-3m ( sin20° + sin(-12.5°)) =
5×10-3×0.125581m
=
0.6279×10-3m = 6.279×10-4 m . (answer)
You have a laser and want to estimate the wavelength. You decide to use a reflective diffraction ...
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