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Optics The Apparent Size of an Object The size of the image on the retina of the observer depends on i) the real size of the object, h ii) the distance of the object from the observer, u.
These two factors (h and u), determine the
size of the angle
subtended at the eye by the object ( The apparent size of an object is proportional to this angle. Optical instruments provide magnification by increasing the size of the angle subtended at the eye. Angular Magnification by a Simple Microscope Angular magnification, M, is defined as
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