Theory of Light
The Sensitivity of the human eye is specific across colors in range of wavelengths from 0.004 mm to 0.00075 mm (equivalent to 4,000 to 7,500 Angstrom Units). Within this spectrum eye perceives different wavelengths as distinct colors.
Theory of Light
The range of electromagnetic radiation visible to the human eye is quite less Which Spans from approximately 4.3×10
14
Hz to 7.5×10
14
Hz. The White sunlight consists of various colors which falls within this visible spectrum with wavelengths ranging from 4,000 to 7,500 Angstrom Units (AU).
Laws of Illumination
Light is an essential element in human life and the day-to-day activities of human beings eventually depend on the light. Where there is no natural light, the use of artificial light is required. Artificial lighting is generated electrically, because of its cleanliness, ease of control, accuracy, and stable output, as well as its low cost it is taking an increasingly major part in modern everyday life.
The science of illumination engineering has become of major importance. Light is a form of luminous energy. Several forms of incandescent bodies are the reference of light and the light radiated by such bodies depends upon the temperature of bodies. Heat energy is emitted into the medium by a body that is much warmer than the medium surrounding it. The heat of the body can be categorized as red-hot or white-hot.
Table of Content
- Illumination
- Important terms
- Properties
- laws of Illumination
- Solved examples
- Advantages
- Disadvantages
- Applications