. Biophysical science. Biophysics. Figure 6. Minimum angle of deviation for light refracted by a prism. Most elementary physics texts show that if A is small O = (n - I)A A H = Yi = 2 (nA) h = y2 = — where n is the index of Figure 7. Refraction by the prism illustrated in Figure 6. A differ- ent wavelength gives a greater deviation. In general, there is not a simple relationship between the angle of deviation and the wavelength. The dial adjusting the prism (and hence, the wavelength selected) must be calibrated for the substance used to form the prism. The purity of the light is
. Biophysical science. Biophysics. Figure 6. Minimum angle of deviation for light refracted by a prism. Most elementary physics texts show that if A is small O = (n - I)A A H = Yi = 2 (nA) h = y2 = — where n is the index of Figure 7. Refraction by the prism illustrated in Figure 6. A differ- ent wavelength gives a greater deviation. In general, there is not a simple relationship between the angle of deviation and the wavelength. The dial adjusting the prism (and hence, the wavelength selected) must be calibrated for the substance used to form the prism. The purity of the light is controlled by width of the slits Sx and S2. For most prisms the slit width W is related to the band width passed by a relationship approximately given by AA/A = kW where k is a constant independent of wavelength or slit width. In other words, for fixed slit width, the fractional or logarithmic bandwidth is approximately constant. A monochromator for which the wavelength calibration depends on geometry only, and for which there is a constant bandwidth, that is A = k'S can be constructed by using a grating in place of the prism to provide. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ackerman, Eugene, 1920-. Englewood Cliffs, N. J. , Prentice-Hall
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