'Order diffraction' presentation slideshows

Chapter 24

352 views • 18 slides

Chapter 24

350 views • 18 slides

Overlapping Orders

Overlapping Orders. Any equivalent m l combinations will share b values. For Example: 1 st Order = 400 nm 2 nd Order = 200 nm 3 rd Order = 133 nm. d(sin a + sin b ) = m ?. Calculate the free spectral range: Dl f = l /(m+1).

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Consider two wavelengths ? 1 and ? 2 that are nearly equal.

mercury. Diffraction Grating Resolving Power. Diffraction gratings let us measure wavelengths by separating the diffraction maxima associated with different wavelengths. In order to distinguish two nearly equal wavelengths the diffraction must have sufficient resolving power, R.

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