WORKING OF COMPOUND MICROSCOPE
The ray diagram given below gives the principle of a compound microscope. The object is mounted on the stand below the microscope tube. The objective lens forms a real, inverted and magnified image (I1) of the object. The image I1 acts as an object for the eye piece. The position of the eyepiece is so adjusted that the image lies within the focus of the eyepiece (Fe). The eyepiece acts like a magnifying glass and forms a virtual erect and magnified image of the object.
Image Formation in a Compound Microscope
- The object (O) is placed just outside Fo, the principal focus of the objective lens.
- Fe is the principal focus of the eye lens.
- A real, inverted magnified image I1 is formed. The magnified image I1 acts as an object for the eye lens.
- The final image I2 is virtual and is magnified still further. It is inverted compared with the object. I2 may appear 1000 times larger than the object