On Mar 31, 6:01 pm, Cecil Moore wrote:

In the following fixed font diagram, IR is the Index
of Refraction.

IR usually means 'infra red' in optics discussions. The letter 'n' is
customarily used for the variable representing index of refraction.
Sort of obviates the need to define one in every discussion.

air | 1/4WL thin-film | Glass
1W Laser---IR=1.0---|----IR=1.222-----|--IR=1.493---...
Ifor=1W | Ifor=1.0101W | Ifor=1W
Iref=0W | Iref=0.0101W | Iref=0

Note that I is "irradiance", not current.

Also note that 'Watt' isn't a unit of irradiance or current.

73, ac6xg