Simple Microscope
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Define Simple Microscope
A simple microscope is one of the simplest of all the optical instruments. It consists of a single convex lens of short focal length. The object to be seen by the simple microscope is kept just inside the focus of the lens. When viewed from the other side, a virtual, erect and enlarged image of the object is seen.
Magnifying power (M) of the simple microscope is given by
M = 1 + D / f
Where, D is the least distance of distinct vision (it is equal to 25 cm for normal human eye) and f is the focal length of the convex lens.
When the eye is fully relaxed, the magnification of the simple microscope is given by
M = D / f
Simple microscope is used as a magnifier for watch repairers, specimen observers, palmists etc. Simple microscope cannot be used to observe the tiny objects like virus and bacteria.
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