Authors: Karunakar Marasakatla
In addition to the brightness of a light emitting (active) object and the distance between the active and passive objects; the amount of light reaches a passive object also depends upon the amount of the surface area of the active object exposed towards the passive object. Inverse square law of distance for light is not valid in instances where the light emitting objects are in different shapes such as sphere (star) or cylinder (florescent tube); in which case the surface area of these objects exposed to an external object varies with the size of the objects.
Comments: 4 pages.
[v1] 22 Aug 2011
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