1. Foot or base
It is a U-shaped structure and supports the entire weight of the compound microscope.
2. Pillar
It is a vertical projection. This stands by resting on the base and supports the stage.
3. Arm
The entire microscope is handled by a strong and curved structure known as the arm.
4. Stage
The flat and rectangular plate that is connected to the arm’s lower end is called the stage. The specimen is placed on the stage for studying and examining the various features. The centre of the stage has a hole through which light can pass.
5. Inclination joint
It is a joint, wherein the arm is fastened to the compound microscope’s pillar. The microscope can be tilted using the inclination joint.
6. Clips
The upper part of the stage is connected to two clips. The slide can be held in its position with the help of the clips.
7. Diaphragm
The diaphragm is fastened below the stage. It controls and adjusts the intensity of light that passes into the microscope. The diaphragm can be of two types:
Disc diaphragm
Iris diaphragm
8. Nose piece
The nose piece is circular and a rotating metal part that is connected to the body tube’s lower end. The nose piece has three holes wherein the objective lenses are embedded.
9. Body tube
The upper part of the arm of the microscope comprises a hollow and tubular structure known as the body tube. The body tube can be shifted down and up using the adjustment knobs.
10. Fine adjustment knob
It is the smaller knob, which is used for sharp and fine focusing of the object. For accurate and sharp focusing, this knob can be used.
11. Coarse adjustment knob
It is a large knob that is used for moving the body tube down and up for bringing the object to be examined under exact focus.
(B) Optical Parts of Compound Microscope
1. Eyepiece lens or Ocular
At the top of the body tube, a lens is planted which is known as the eyepiece. On the rim of the eyepiece, there are certain markings such as 5X, 10X, 15X, etc. Which indicates the magnification power. The object’s magnified image can be observed with the help of an eyepiece.
2. Mirror
A mirror is found attached wither to the pillar or the lower end of the arm. It consists of a concave mirror on one side and a plain mirror on the other side. It can be used for reflection of light rays into the microscope.
3. Objective lenses
At the bottom of the body tube, there are two objective lenses, which are connected to the revolving nose piece. The three objective lenses are as follows:
Explanation:
