How does light intensity decrease?
If I shine a flashlight on the wall, the light intensity in the middle will be higher than the instensity on the sides of the circle. How can I determine how the light intensity decreases? Thanks
- Anonymous3 years ago
Measure it with a light meter.
- Steve4PhysicsLv 73 years ago
Experimentally you would use a light-meter to measure the intensity at different positions in the beam. If you don't have one, this could be made from a light-dependent resisistor if you have a calibration curve showing the resistance as a function of intensity.
Theoretically it would be very difficult to calculate as it depends on the type/size/shape of the bulb and any reflectors/lenses in the flashlight.