the spectrum have different wave lengths,it is necessary to focus the slit for each color if the sharpest possiblepictures are desired. It will be found that the eye-lens of the ocular must be fartherfrom the slit for the sharpest focus of the red end than for the sharp-est focus of the lines at… … Fig. 138 Fig. 139 Fig. 140 Fig. 138. (1). Section of the tube and stage of the microscope with thespectral ocular or micro-spectroscope in position. Amici Prism (§ 210). — The direct vision prism of Amici in which the cen-tral shaded prism of flint glass gives the dispersion or separation into…
Microscopy
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