Physics Optics: For an infinity optical system, explain why the magnification is determined by the ratio of the focal tube length over the focal objective length. Include a diagram showing the focal tube length and the focal objective.
Physics Optics: For an infinity optical system, explain why the magnification is determined by the ratio of the focal tube length over the focal objective length. Include a diagram showing the focal tube length and the focal objective.
Infinity optical systems allow introduction of auxiliary components, such as differential interference contrast (DIC) prisms, polarizers, and epi-fluorescence illuminators, into the parallel optical path between the objective and the tube lens with only a minimal effect on focus and aberration corrections. Older finite, or fixed tube length, microscopes have a specified distance from the nosepiece opening, where the objective barrel is secured, to the ocular seat in the eyepiece tubes. This distance is referred to as the mechanical tube length of the microscope. The design assumes that when the specimen is placed in focus, it is a few microns further away than the front focal plane of the objective.
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