Aperture vs. Iris

Aperturenoun

An opening, gap, or hole, usually small and narrow

Aperturenoun

(optics) Something which restricts the diameter of the light path through one plane in an optical system.

Aperturenoun

The diameter of the aperture (in the sense above) which restricts the width of the light path through the whole system. For a telescope, this is the diameter of the objective lens.

Aperturenoun

The (typically) large-diameter antenna used for receiving and transmitting radio frequency energy containing the data used in communication satellites, especially in the geostationary belt. For a comsat, this is typically a large reflective dish antenna; sometimes called an array.

Aperturenoun

The maximum angle between the two generatrices.

Aperturenoun

The act of opening.

Aperturenoun

An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall.

Aperturenoun

The diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four-inch aperture.

Aperturenoun

a device that controls amount of light admitted

Aperturenoun

a natural opening in something

Aperturenoun

an man-made opening; usually small

Aperture

In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture and focal length of an optical system determine the cone angle of a bundle of rays that come to a focus in the image plane.

Irisnoun

(botany) A plant of the genus Iris, common in the northern hemisphere, and generally having attractive blooms (See Iris (plant)).

Irisnoun

(anatomy) The contractile membrane perforated by the pupil, which adjusts to control the amount of light reaching the retina, and which forms the colored portion of the eye (See Iris (anatomy)).

Irisnoun

A diaphragm used to regulate the size of a hole, especially as a way of controlling the amount of light reaching a lens.

Irisnoun

(poetic) A rainbow, or other colourful refraction of light.

Irisnoun

(electronics) A constricted opening in the path inside a waveguide, used to form a resonator.

Irisnoun

(zoology) The inner circle of an oscillated color spot.

Irisverb

To open or close in the manner of an iris.

Irisnoun

The goddess of the rainbow, and swift-footed messenger of the gods.

Irisnoun

The rainbow.

Irisnoun

An appearance resembling the rainbow; a prismatic play of colors.

Irisnoun

The contractile membrane perforated by the pupil, and forming the colored portion of the eye. See Eye.

Irisnoun

A genus of plants having showy flowers and bulbous or tuberous roots, of which the flower-de-luce (fleur-de-lis), orris, and other species of flag are examples. See Illust. of Flower-de-luce.

Irisnoun

See Fleur-de-lis, 2.

Irisnoun

the inner circle of an oscillated color spot.

Irisnoun

same as iris diaphragm.

Irisnoun

plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals

Irisnoun

muscular diaphragm that controls the size of the pupil; it forms the colored portion of the eye

Irisnoun

diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening