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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.
Higher magnification shows smaller area. FOV at 40x is ~4x smaller than at 10x. Formula: FOV = field number / objective mag.
Ref: NCERT Biology Laboratory Manual, Class XI, Microscope handling and safety precautions.
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