Share this entry

Share this page

critical angle

Line breaks: crit|ic¦al angle

Definition of critical angle in English:

noun

Optics
The angle of incidence beyond which rays of light passing through a denser medium to the surface of a less dense medium are no longer refracted but totally reflected.
Example sentences
  • For angles exceeding the critical angle, the refracted waves are evanescent and the reflectivity is very close to unity.
  • Compared with the intensity enhancement for total internal reflection (~ 4 times that of the incident light) at the critical angle, the enhancement for SPR can reach up to 20-30 times higher.
  • If the beam through m1 is greater than the critical angle, then the refracted beam will be reflected entirely back into m1 (total internal reflection), even though m2 may be transparent!

Definition of critical angle in:

Share this entry

Share this page

 

What do you find interesting about this word or phrase?

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day verbose
Pronunciation: vəːˈbəʊs
adjective
using more words than are needed…