Light Wide Angle
7
Apr/100
Apr/100
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What wavelength of light is used?
Monochromatic light falls on a slit that is 2.60 x 10^-3 mm wide. If the angle between the first dark fringes on either side of the central maximum is 35.0 degrees (dark fringe to dark fringe), what is the wavelength of the light used?
n. wavelength = d sin(angle)
n = 2 (This is the case for single slit diffraction - either n is doubled or d is halved - gives same result)
2.wavelength = 2.6 . 10^–6 . sin35 = 1.49 . 10^–6
wavelength = 0.750 . 10^–6 m = 750 nm
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