Focal point

Focal point

Image point conjugate to an infinitely distant object point on the optical axis.

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Part of Speech: noun
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Blossary:
Industry/Domain: Eyewear
Category: Optometry
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Related terms

focal point

Eyewear; Optometry

Image point conjugate to an infinitely distant object point on the optical axis.

focal point

Art history; Visual arts

That which in an image forms the center of interest or attention, whether through purely formal means or through the specific meaning it has within the image and/or for viewers.

focal point

Aerospace; Satellites

The point toward which light rays converge to form an image after passing through a lens or having been reflected by mirrors. The condition of sharpest imagery.

focal point

Physics; General physics

The point of a mirror or lens where all light that runs parallel to the principal axis will be focused. Concave mirrors and convex lenses are designed to focus light into the ...

focal point

Photography; Professional photography

point of light on the optical axis where all rays of light from a given subject meet at a common point of sharp focus.

focal point

Aerospace; Satellites

The area toward which the primary reflector directs and concentrates the signal received.

ophthalmoscope

Eyewear; Optometry

An optical instrument used to examine the external and internal parts of the eye, particularly the media and the fundus.

pantoscopic angle

Eyewear; Optometry

1. Angle in the vertical plane between the optical axis of a spectacle lens and the visual axis of the eye in the primary position, usually taken to be the horizontal. 2. Angle ...

optical material

Eyewear; Optometry

Transparent material capable of being manufactured into optical components.

optical radiation hazard

Eyewear; Optometry

Possibility of damage to the retina by optical radiation.

optical centre

Eyewear; Optometry

For practical purposes, the intersection of the optical axis with the front surface a lens.

ophthalmoscope

Optometry; Optometry

An optical instrument used to examine the external and internal parts of the eye, particularly the media and the fundus.

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