point focus
Physics
noun
A focus of a beam of light, particles, etc., which is small enough to be considered as a point.
Origin
Early 20th century.
- thermic
- thermic lance
- Thermidor
- Thermidorian
- thermion
- thermionic
- thermionic emission
- thermionics
- thermionic tube
- thermionic valve
- thermistor
- thermit
- thermite
- thermo-
- thermoacidophile
- thermobaric
- thermochemical
- thermochemistry
- thermochromic
- thermocline
- thermocouple
- thermodynamic
- thermodynamical
- thermodynamically
- thermodynamicist