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Unformatted text preview: Average diffraction angle for Red: θ AVG =21˚ Wavelengths of Sodium Yellow D-line can be measured using equation: Where d =16667 Å = 16667 x 10-10 m Thus, ? EXP = 597.29nm Now for Sodium Yellow D-line of order m=1 theoretical wavelengths are ? 1 = 5889.95 Å and ? 2 = 5895.92 Å Thus average theoretical/calculate ? CALC. = 589.29nm The difference between experimental and calculated wavelengths is 1.35% VI-5 For Red Wartten Filter Cut off angles: θ LEFT =20.5˚ , θ RIGHT =20.5˚ Average diffraction angle for Red: θ AVG =20.5˚ Wavelengths of Sodium Yellow D-line can be measured using equation: Where d =16667 Å = 16667 x 10-10 m Thus, ? CUT-OFF = 583.69nm VII-1 Equation 5: Now σ ? depends on value of θ VII-2 VII-3 For a given wavelength ? , the maxim order of diffraction m max which can be observed is m=5...
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- Spring '11
- Light, red line, Fraunhofer lines, Average diffraction angle, Sodium Yellow D-line