Functional role of the reflector in the light microscope
Reflector is a double-sided mirror that can be rotated at will, with a diameter of 50mm, one side is flat, one side is concave, and its function is to reflect the light coming from any direction through the through-hole. Flat mirror reflects light weakly, is used when the light is strong, concave mirror reflects light strongly, is used when the light is weak.
Reflector is usually a plane mirror on one side, the other side is a concave mirror, mounted under the concentrator, can be rotated in both horizontal and vertical directions.
The role of the reflector is to make the light emitted by the light source or natural light to the concentrator. When using the concentrator generally use a plane mirror, when not used with a concave mirror; when the light is strong with a plane mirror, when weak with a concave mirror.
The reflector should be placed vertically after observation.
Introduction to the function of variable diaphragm of optical microscope
The variable diaphragm, also called the aperture, is located below the condenser lens and consists of a dozen or so thin metal sheets with a circular hole formed in the centre part. Its function is to adjust the light intensity and to adapt the numerical aperture of the condenser lens to the numerical aperture of the objective lens. The larger the variable diaphragm is opened, the larger the numerical aperture is (the aperture should be adjusted to its maximum after observation).
Below the variable diaphragm, there is a circular filter holder.
Note: In secondary school laboratories only the teacher's microscope (1600× or 1500×) is equipped with a condenser, the student's microscope (640× or 500×) is equipped with a rotating light bar. Immediately below the stage, can do circular rotation of the disc, rotating light bar (also known as the light shades), light bar on the size of the circular hole, called the aperture. Diameter were 2, 3, 6, 12, 16mm, rotating rotating light bar, light bar on each aperture can be right through the light hole, through the size of the aperture to adjust the intensity of light.
