Depth of Field refers to the depth of the specimen layer which is in sharp focus at the same time, even if the distance between the objective lens and the specimen plane is changed when observing and shooting the specimen plane by microscope. As human eyes are individually different in the ability of their focus adjustment, each person's perception of the focal depth varies.At present, the Berek formula is generally used, because it gives a focal depth value that often coincides with that obtained through experiments.

Focal depthcamera

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In the case of a video camera, the focal depth will vary according to number of pixels of CCD, optical magnification, and numerical aperture. The above-mentioned formula is used as a rough guide only.

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For smaller, compact cameras they're given in fractions of an inch (1/N inch format). You should be aware that 1/N designations do not tell you the diagonal of ...

Optics introduction and Dual nature of light. Simplify JEE · 2:59. Geometrical optics sub topics and brief description. Simplify JEE.

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Since they can not meet on the right side , therefore real image can not be formed. (b). Focal length of the lens (f) = 12 mm. Object distance (u) = 7 mm. Now ...