Inverse Square Law of Illumination | New Note [2024]

In this note, we are going to know about the Inverse Square Law of Illumination. Welcome to Poly Notes Hub, a leading destination of engineering notes for diploma and degree engineering students.

Author Name: Arun Paul.

Inverse Square Law of Illumination

According to the Inverse Square Law of illumination, the intensity of light or illumination from a point source reduces as the square of the distance from the source increases. In other words, increasing the distance from a light source reduces the illumination to one-fourth of its original intensity.

I∝(1/d²)

where:

• I = intensity of illumination.
• d = distance from the light source.

Practical Application of Inverse Square Law

• In architectural and stage lighting, this law aids in the placing of lights to reach desired illumination levels.
• Photographers utilize this equation to adjust light sources for optimal exposure and effects.
• Calculates the required light source distances and intensities to ensure appropriate lighting in places such as streets and parking lots.