Simple Microscope

Suppose an object of length h is placed at the near point A and viewed by the eye. Then the visual angle is .



Now suppose that a convex lens L of focal length ƒ is used as a magnifying glass and the object AB is placed between O and F, such that the magnified erect image PQ is formed. If the observer’s eye is close to the lens, then the distance OP is equal to the least distance of distinct vision. Here the visual angle is given by



dividing (ii) by (i),





If M is the magnifying power

Here, v = –D, and u is also negative

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