ILLUMINATION
Illumination is the utilization of light energy.
When a body is heated, the heat energy is absorbed by the body and emits to the atmosphere, the energy the transmitted in this way is known as "Radiant Energy".
Light:- The Radiant energy in form of waves, which produces a sensation of vision upon the human eye is called "Light".
Luminous Body:- The body that emits the light waves is known as "Luminous body".
Luminous Flux:- when a body is heated, its temp. increases.It radiates energy. when it become red hot, it emits light in the form of light waves,that is called "Luminous Flux".
lumen:- "Lumen" is the SI unit of luminous Flux.
lumen=CP x ω
CP- Candle power ,ω=solid angle
Candle
Power:-The light radiating capacity of a source in a given direction is known
as "Candle Power".
C.P
= lumen/ω
LUX:- "LUX" is the SI unit of Illumination. it is defined as the luminous flux falling per square meter on the surface which is every where perpendicular to the rays of light from a source.
LUX = luminous flux/ area πr2
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