Why should both the objective and the eyepiece have small focal length in a microscope?
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Since the objective provides a real image, the magnification of theobjective is approximately equal to the ratio of the microscope tube length(typically 150–200 mm) to the focal length of the objective. If you have a 150 mm optical tube length and want 10X from the objective, its focal lengthwill be close to 15 mm.
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Since the objective provides a real image, the magnification of theobjective is approximately equal to the ratio of the microscope tube length(typically 150–200 mm) to the focal length of the objective. If you have a 150 mm optical tube length and want 10X from the objective, its focal lengthwill be close to 15 mm.
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