Abstract: To study whether the relationship between light intensity varies inversely with the square of the distance is true in real-world situations and/or laboratory conditions. Additionally, the techniques used in the experiment included measuring the distance between the light source and the light sensor, recording the light intensity of a light source, and recording observations accurately. The light from the light source passing through the cylindrical cardboard tube changes as the distance from the light sensor increases. The result shows that the relationship between light intensity varies inversely with the square of the distance is true in real situations and/or laboratory conditions. Introduction: The purpose of this experiment was to study whether the relationship between light intensity varies inversely with the square of the distance holds the truth in real-world situations and/or laboratory conditions. Since, light from a non-coherent light source will propagate uniformly in all directions. In other words, any point source that extends its influence equally in all directions with no range limit will obey the inverse square law. Light intensity is proportional to the inverse of the square of the distance, I ∝1/r2. The light intensity is equal to the light reflux relative to the watts. Luminous intensity is the power of light energy and its unit is the candle (cd). The unit of lighting reflux is the lumen (lm). It is assumed that if the distance increases, the light intensity will decrease and therefore obey the inverse square law. The graph above demonstrates that the further the light sensor is from a light source, the less bright the source is. This measurement...... middle of paper...... tube.5. The microscopic light was placed in the mouth of the cylindrical cardboard tube, facing the light sensor.6. The light sensor was connected to the Quest.7 laboratory. The distance between the light sensor and the microscopic light was measured using the ruler. The distance was recorded in a data table.8. The microscopic light was turned on by plugging it into the wall outlet.9. The light sensor was turned on to measure the light intensity of the microscopic light. The light intensity data of the microscopic light were saved under an appropriate name on a USB stick. The data was recorded in a table at home.10. Steps 4, 5 and 6 were repeated three times but with different distances, different light sources such as LED light and fluorescent light. In the laboratory: Repeat the procedure for the real situation but in a dark room..