Word: Iris Diaphragm
Definition: An iris diaphragm is a part of some cameras and microscopes that consists of thin overlapping plates. These plates can be adjusted to change the size of a central opening, which controls how much light enters the device.
Usage Instructions:
You will often find an iris diaphragm in optical devices like cameras and microscopes.
By turning a knob or lever, you can make the central hole bigger or smaller.
Adjusting the iris diaphragm helps to get a better picture by controlling the light.
Example:
Advanced Usage:
In photography, a wide-open iris diaphragm (large opening) allows more light and can create a blurry background effect, known as "shallow depth of field."
In microscopy, adjusting the iris diaphragm can help in viewing different details of a specimen by increasing or decreasing contrast.
Word Variants:
Iris (noun): Refers to the colored part of the eye which also has a diaphragm function, controlling how much light enters the eye.
Diaphragm (noun): While "iris diaphragm" is a specific term, "diaphragm" can also refer to other types of structures that regulate intake or output in various contexts (like in music, where it refers to a sound-producing membrane).
Different Meanings:
Synonyms:
Idioms and Phrasal Verbs:
Summary:
The iris diaphragm is a useful tool for controlling light in optical devices.