An object is placed at a distance u from a simple microscope of focal length f. The angular magnification obtained depends

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on f as well as u ​The angular magnification is the ratio of the angle subtended by the image to the angle subtended by the object on an unaided eye. In a simple microscope, m=(h/u)/(h/D) Here, u = Object distance from the lens D = Image distance from the lens h = Height of the object In normal adjustment, the object is placed at a distamce equal to ​focal length(f) from the lens and then magnification is given by m = D/f. For u < f, m = D/f +1.

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