Practice question
Question
When calculating total magnification, a 15x eyepiece with 40x objective gives, and field number 18 mm, what is approximate FOV diameter?
Explanation
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.
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