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FOV = FN / objective mag. FN 18 mm /40 = 0.45 mm. Eyepiece mag does not affect FOV diameter formula, but affects total mag (600x). High WF eyepieces increase FN.
Ref: NCBI Bookshelf, Molecular Biology of Cell: Resolving power, numerical aperture, and Abbe limit.
10×100 = 1000x is maximum with light microscope. Beyond this empty magnification without gain in resolution.
Ref: NCERT Biology, Class XI, Practical guidelines for slide observation and field of view.
Total magnification = ocular magnification × objective magnification = 10×40 = 400x.
Ref: NCERT Biology Laboratory Manual, Class XI, Calculation of total magnification.
Standard eyepiece is 10x (wide-field WF10x). Some have 15x. Total magnification = eyepiece x objective.
Ref: NCERT Biology, Class XI, Chapter 8: Optical parts of microscope, eyepiece role.
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