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Double slit vs diffraction grating similarity’s and differences (Double…
Double slit vs diffraction grating similarity’s and differences
Double Slit
Differences
Results are bands of fringes
Only two slits
Equation:
W = Width of fringe (M)
lambda = wavelength (M)
D = Distance between slits and screen (M)
S = Slit separation (M)
Similarity’s
Source of light
Laser
One colour (one frequency/wavelength), “Monochromatic source”
Blue
350 nm
Green
300 nm
Red
650 nm
One wavelength
Must be coherent = Constant phase difference
Diffraction
Differences
Results are spots that spread out from the centre
Multiple slits
Equation:
n = Order of fringe (M)
lambda = wavelength (M)
d = Diffraction gradient separation [same as S] (M)
sin(theta) = angle of a bright fringe from the centre
