principal focus


Origin of principal focus

1
First recorded in 1825–35

Words Nearby principal focus

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use principal focus in a sentence

  • The distance from the principal focus to the center of the lens is the focal length or principal focal distance of the lens.

    Physics | Willis Eugene Tower
  • The point midway between the vertex V and center of curvature C is called the principal focus, F.

    Physics | Willis Eugene Tower
  • The principal focus of a concave mirror may be observed by holding the mirror in a beam of sunlight entering a darkened room.

    Physics | Willis Eugene Tower
  • The greater the refractive power of the lens, the greater the bending, and the nearer the principal focus to the lens.

    General Science | Bertha M. Clark
  • If the light be placed beyond the principal focus of the lens, the rays will converge to a point some distance ahead of it.

British Dictionary definitions for principal focus

principal focus

noun
  1. another name for focal point

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