No worries, I'm here to help you understand why a flashlight appears less and less bright as you move farther away from it.
Light intensity decreases with distance due to a phenomenon called the inverse square law. According to this law, the intensity of light diminishes as the square of the distance increases. To put it simply, the light spreads out over a larger area as you move away, causing the same amount of light to be spread over a wider surface.
To understand this, imagine a flashlight emitting light in all directions. As you move away, the light rays spread out and cover a larger area. Since the total amount of light energy remains the same, it becomes more diluted or spread out, resulting in less and less light reaching each unit of area.
Think of it this way: if you were standing really close to the flashlight, the light would be concentrated in a small area, making it appear bright. But as you move away, the same amount of light gets distributed over a larger area, making it appear dimmer.
So, even though the flashlight does not lose power as you walk away, the diminishing brightness is a result of the light spreading out and covering a larger area as the distance increases.