Tuesday, 18 June 2013


A microscope (from the Ancient Greek: μικρός, mikrós, "small" and σκοπεῖν, skopeîn, "to look" or "see") is an instrument used to see objects that are too small for the naked eye. 

Compound Microscope

 A simple microscope is used to observe small objects. However it cannot be used tosee very minute objects like blood corpuscles, plant and animal cells, microorganisms like bacteria etc. For observing these objects, we use an opticalinstrument called      a    compound microscope.


A compound microscope consists of the following parts:
  • Objective lens

The objective lens of a compound microscope is a convex lens of very short focal length (fo) that is fo < 1cm. The object to be seen is kept very close to the objective lens.
  • Eye piece

The eye piece of a compound microscope is also a convex lens of short focal length fe. But fe > fo.
  • Microscope tube

The objective lens and the eyepiece are mounted coaxially (having a common axis) at the ends of two brass tubes which can be made to slide into each other so that the distance between the two lenses can be adjusted.


  1. The objective produce a real inverted & magnified image of the object.
  2. The eye piece is placed within the focal length of the object infront of the image formed by it.
  3. The eye piece serve as magnifying glass & produces a very much enlarged image of the object which is inverted.


 It is used by Pathologists,Microbiologists in laborateries

Compound Microscope




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