Illustration modeling the illumination on a surface when the surface is not perpendicular to hte rays of light from a source of light.

Illumination of a Surface When the Surface is not Perpendicular to the Source

Illustration modeling the illumination on a surface when the surface is not perpendicular to hte rays…

An artificial source of visible illumination.

Candle Lamp

An artificial source of visible illumination.

A lamp that burns illuminating gas

Gas Lamp

A lamp that burns illuminating gas

A piece of furniture holding one or more electric light bulbs

Portable Lamp

A piece of furniture holding one or more electric light bulbs

A lamp supported on a lamppost; for illuminating a street

Street Lamp

A lamp supported on a lamppost; for illuminating a street

An often portable case with transparent or translucent sides for holding and protecting a light.

Lighting Lantern

An often portable case with transparent or translucent sides for holding and protecting a light.