Which different supports from a part of the matte box?

The barn doors, and the filters form a part of the matte box

Explanation:

matte boxes are attachments that usually fit in front of the camera. They have many slots in which you can insert filters that allow you to manipulate colors in the shots , The matte box contains barn doors to protect your lens from the light.

the answer to your question would be something called hertz. the unit of measurement called a hertz, which is one cycle per second, is used to measure clock speed. within one cycle, your computer processes, refreshes, or updates itself to the changes that it is going through. in the case of computer clock speed, one hertz equals one tick per second. the clock speed of computers is usually measured in megahertz (mhz) or gigahertz (ghz)