Light Properties are an electromagnetic wave. Visible light has a narrow band of electromagnetic spectrum nearly 400nm to 700nm light is visible and other bands not visible to human eye.
- The electromagnetic spectrum shown in the figure shows other waves are present in the spectrum like microwave infrared etc.
- Also, Frequency value from 4.3 X 10^14 hertz (red) to 7.5 X 10^14 (violet) is visible renge.
- We can specify a different color by frequency for by wavelength λ of the wave.
- We can find the relation between f and λ as follows: 𝑐 = λ
- Frequency constant for all the material but the speed of the light and wavelength are material dependent.
- Moreover, For producing white light source emits all visible frequency light.
- The reflected light has some frequency and some absorbed by the light. This frequency reflected back to decide the color we see and this frequency called as dominant frequency (hue) and corresponding reflected wavelength is called dominant wavelength.
Other Light Properties purity and Brightness a perceived intensity of light. Intensity the radiant energy emitted per unit time, per unit solid angle and per unit projected area of the source.
- Purity or saturation of the Light Properties describes how washed out or how “pure” the color of the light appears.
- Dominant frequency and purity both collectively refer as chromaticity.
- Also, If two color source combined to produce white light they called the complementary color of each other. For example, red and cyan complementary color.
- Moreover, Typical color models that used to describe the combination of light in terms of dominant frequency use three colors to obtain the reasonable wide range of colors, called the color gamut for that model.
- Two or three colors used to obtain other colors in the range called primary colors.