Polarisation of Light :- polarisation of light is the property of transverse wave that can oscillate with more than one orientation. A light wave that is vibrating in more than one plane is referred to as unpolarised light. The process of transforming unpolarised light into polarised light is known as polarisation of light. If the…
Resolving power of Optical Instruments :- Resolving power of Optical Instruments is the ability of an Imaging device to separate points of an object that are located at a small angular distance or It is the power of an optical instrument to separate far away objects, that are close together into individual images. Consider a…
Diffraction of Light :- Diffraction of light is the slight bending of light as it passes around the edge of an object. The amount of bending depends on the relative size of the wavelength of light to the side of the opening. Explanation of the Intensity distribution in the diffraction pattern :- Figure shows a…
Interference of Light Waves :- When two light waves from different sources meet together, then the distribution of energy due to one wave is distributed by the other. This modification of light energy due to superposition of two light wave is called interference of light waves. Coherent sources :- Those sources of light which emit…
Huygens’s Wave Theory :- Scientist Christian Huygens in 1678 found that light is a form of wave, He found that light propagates in the form of waves and need a medium to propagate in all possible direction, he proposed a theory of wave called Huygens’s wave theory. He told that the secondary source which is…
Deviation without Dispersion :- Deviation produced by flint glass prism for a colour is equal and opposite which produced by crown glass prism. As a result, when the seven colours of light comes out through the flint glass prism, they combine to give a white light. Hence, there is no dispersion of light. This combination…
Optical microscope:- The optical microscope, often referred as the light microscope. It is a type of microscope that uses visible light and a system of lenses to magnify images of small objects. There are two basic types of optical microscope. 1. Simple microscope. 2. Compound microscope. Simple microscope:- A simple microscope is actually a Convex…
Human Eye :- The human eye is the most complicated Sense organ in the body with several parts fixed together form a spherical structure. Our eye is one of the most important optical device the nature has endowed us with. Sclerotic :- It is a tough and thick white sheat that protects the inner parts…
Dispersion of light :- Dispersion of light is the phenomenon of splitting of a beam of white light into its 7 constituent colours when passed through a transparent medium like water droplets or Prism . It was discovered by Isaac Newton in 1666 . Newton discovered that light is made up of seven different colours…
Dispersion by a prism :- When white light ( Sun light ) is incident on a glass prism, the emergent light is seen to be consisting of several colours, the phenomenon of splitting of light into several component colours is known as dispersion. The different component colours that appear in sequence are violet, indigo, blue,…
Angle of deviation ( δ ) :- The passes of light through a triangular prism ABC, The angles of incidence and refraction at the first face AB are i₁ and r₁ while the angle of incidence at the second face AC is r₂ and the angle of refraction or emergence i₂ . The angle between…
Equivalent focal length of two lenses :- Let us consider two lenses L₁ ( focal length f₁ ) and L₂ ( focal length f₂ ) are separated by a distance d and P₂ is equivalent lens of both lenses ( focal length f ). Angle of deviation produce by the lenses P, L₁ and L₂…
