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Optics is a branch of physics which deals with study of phenomena like reflection, refraction, dispersion, interference, diffraction etc. The subject of optics has been divided into ray optics and wave optics. The branch of optics that deals with the production, emission and propagation of light, its nature and the study of the phenomenon of interference, diffraction and polarization is called wave optics.
Scientists have made discussion on true nature of light and have postulated various theories. These are discussed below:
According to wave theory, a source of light sends out disturbance or waves in all directions. A wave front as the locus of all adjacent points at which the phase of vibrations of a physical quantity associated with the wave is the same.
Depending on the nature of the source of light, there are three types of wave fronts:
Manu Kumar Khatry, Manoj Kumar Thapa, Bhesha Raj Adhikari, Arjun Kumar Gautam, Parashu Ram Poudel. Principle of Physics. Kathmandu: Ayam publication PVT LTD, 2010.
S.K. Gautam, J.M. Pradhan. A text Book of Physics. Kathmandu: Surya Publication, 2003.
Optics is a branch of physics which deals with study of phenomena like reflection, refraction, dispersion, interference, diffraction etc.
Newton put forward this theory that consist of tiny particles, called corpuscles, which are shot out by luminous objects such as an electric lamp, candle, etc.
Theoretically light gets propagated in the form of electromagnetic waves, consisting of electric and magnetic fields mutually perpendicular as well as transverse to the direction of propagation of light.
According to Einstein's photoelectrical, light is transmitted as tiny packets of energy called photons and energy of each photon..