Light Intensity Calculator — सूत्र
## Light Intensity (Inverse Square Law)
Light intensity from a point source decreases with the square of the distance.
### Formula
**I = P / (4 * pi * r²)**
where P is the total power output and r is the distance from the source. Doubling the distance reduces intensity by a factor of four.
Light intensity from a point source decreases with the square of the distance.
### Formula
**I = P / (4 * pi * r²)**
where P is the total power output and r is the distance from the source. Doubling the distance reduces intensity by a factor of four.
हल किया गया उदाहरण
A 100 W light bulb at 2 meters distance.
- I = P / (4*pi*r²)
- I = 100 / (4*pi*4)
- I = 100 / 50.27
- I = 1.989 W/m²