focal plane

noun

Definition of focal plane

  1. :  a plane that is perpendicular to the axis of a lens or mirror and passes through the focus

1889

First Known Use of focal plane

1889


Medical Dictionary

focal plane

noun

Medical Definition of focal plane

  1. :  a plane that is perpendicular to the axis of a lens or mirror and passes through the focus

Learn More about focal plane


Seen and Heard

What made you want to look up focal plane? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

capable of being understood in two ways

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ