It measures the total amount of light emitted by a light source in all directions. The lumen (symbol: lm) is the unit for luminous flux. In the electromagnetic spectrum, this field lies between infrared and ultraviolet. The wavelength of visible light is between 380 nm and 760 nm. Objects that can be seen by emitting light spontaneously are called light sources.

Light is a matter that enables living beings to see by hitting objects or directly reflecting off a radiation after it emerges from the light source. We cannot see this with the naked eye, but if we look at it with a cell phone camera, we can see light at a frequency that the eye cannot see. On the contrary, if the frequency decreases to a lower frequency than red, it is called infrared light.įor example, the TV remote emits infrared light when operating.

If the frequency of the light increases further, it goes beyond our vision limit and is called ultraviolet light. The human eye is capable of seeing colors between red and purple. The color of the light changes according to the frequency it has. Since light is in a wave form, it has a certain frequency value. Polarity: It is the angle of vibration, it is not perceived by the human eye under normal conditions. Intensity: Also referred to as amplitude, it is perceived as brightness by the human eye. Light and all other electromagnetic waves basically have three properties:įrequency: It is inversely proportional to the wavelength and the human eye perceives this feature as color. Light is the electromagnetic waves that propagate in linear waves.

Lumen intensity