الصوت والضوء: شدة الاستضاءة

The video tutorial introduces the concept of light intensity through a simple experiment. It demonstrates how light intensity decreases as the distance from the light source increases, illustrating the inverse square law. The experiment involves using a flashlight and a wall to observe changes in light spot size and intensity at varying distances. The tutorial concludes by defining light intensity as the amount of light falling perpendicularly on a unit area of a surface per second.

What new insight or understanding did you gain from this video?