How does light intensity change according to the Inverse Square Law?

How does light intensity change according to the Inverse Square Law?

• A. If you double the distance from a light source, you receive half the light
• B. If you double the distance from a light source, you receive a quarter of the light
• C. If you approach the light source, the light intensity remains constant
• D. If you double your distance from a light source, you receive the same amount of light

Answer: (B)

The Inverse Square Law states that the intensity of light (or any point source of energy) is inversely proportional to the square of the distance from the source. This means that as you move further away from a light source, the intensity of light decreases rapidly. When you double your distance from the light source, the light intensity is not just halved, but actually reduced to a quarter of its original intensity. This occurs because the light spreads out over a larger area as the distance increases. Specifically, if you consider a light source and the area it lights up, when you double the distance, the area increases by a factor of four (since area is proportional to the square of the radius), resulting in only a quarter of the original light intensity reaching you. Therefore, the correct answer highlights this relationship accurately, demonstrating how the strength of light diminishes with increased distance according to the Inverse Square Law.

The Inverse Square Law states that the intensity of light (or any point source of energy) is inversely proportional to the square of the distance from the source. This means that as you move further away from a light source, the intensity of light decreases rapidly.

When you double your distance from the light source, the light intensity is not just halved, but actually reduced to a quarter of its original intensity. This occurs because the light spreads out over a larger area as the distance increases. Specifically, if you consider a light source and the area it lights up, when you double the distance, the area increases by a factor of four (since area is proportional to the square of the radius), resulting in only a quarter of the original light intensity reaching you.

Therefore, the correct answer highlights this relationship accurately, demonstrating how the strength of light diminishes with increased distance according to the Inverse Square Law.