That would be the sphincter muscles in the eye that surround the pupil and contract in order to widen it and allow in as much light as possible.
Human A&P Lab manual (cat version), N. Marieb, Pg. 346. "Place the slide on the stage, and locate the cells at the lowest power. You will probably want to dim the light with the iris diaphragm to provide more contrast for viewing the lightly stained cells. Furthermore, a wet mount will dry out quickly in bright light because a bright light source is hot." The answer I believe is 'to provide more contrast'
Your eyes are very clever pieces of equipment. The amount of light in a dark room compared to sun light is 1000s of times different, so your eyes need to adjust to the amount of light to allow you to see things. In the dark, it will increase the size of your iris, which lets light in to the eye. When its bright, the iris shrinks to let a smaller amount of light through. The increasing and decreasing of the iris can take several seconds to adjust which is why at first you cant see anything in a dark room. If too much light enters the eye, it will permanently damage the light sensors (the rentner) at the back of your eye render you blind.
When a menu command in Windows is greyed out or dimmed, it means it is not available. It is possible that the user does not have enough privileges to use the command.
Suddenly, the lights dimmed. She dimmed the lights.
what is a dimmed command for computer
Yes, it is dimmed.
Aaron Douglas uses dark blue,dimmed red,black,and dark green.
i walked over to the electric chair and DIMMED the lights before i gave the prisoner the charge.
Sodium lamps can be dimmed but we shall have to look at the effect of low voltage on lamps
Yes. It is a way of distinguishing the different parts of the document.
adverb
Yes
The sun has dimmed.
The past tense of dim is dimmed.