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 Q. Explain the term interference and give the analytical treatment of interference.  Ans : Interference : When two or more than two waves travel in a medium then the modification in the intensity distribution in the region of superposition is called as interference.  At the points where waves superpose with the same phase the intensity is maximum; and is called as constructive interference. While the points where waves superpose with the opposite phase the intensity is minimum; and is called as destructive interference.  Types of Interference : Interference can be classified on the basis of the way interference is produced. The interference is classified as: 1.Interference by Division of wavefront : When the incident wavefront is divided into two parts by the phenomenon of reflection refraction. When these two divided parts reunite then the interference obtained is called interference by division of wavefront. The examples are Fresnel bi prism, Lloyd’s mirror. 2....

 Q. Explain the principle of superposition of light? Ans : According to the principle of superposition when two or more than two waves are travelling in a medium then the resultant displacement of a particle of medium is the algebraic sum of  displacements produced by individual waves. For example if ‘n’ waves are travelling in a medium and each one of them produces displacement Y1, Y2, Y3, Y4,……Yn,  then the resultant displacement of the particle will be given as:   Y = Y1 + Y2 + Y3 + Y4 +…………..+ Yn For Full Notes pdf  -  Click here For Full Notes pdf  -  Click here

wave optics    Q.   Explain Huygens’s wave theory of light .       According to Huygens’s principal, each point in a source of light emits   waves in all directions in hypothetical medium ether. To explain the wave  theory of light Huygens proposed the concept of wavefront which is defined as an imaginary surface in the forward direction of light propagation at which all the points oscillates in the same phase. Shape of wavefront depends upon the shape of light source, based on this wavefronts are divided as ....  1. Spherical wavefront : If the source of light is a point source then the shape of wavefront       in such case will be spherical. 2. Cylindrical wavefront: If the source of light is a line source then the shape of wavefront      in such case will be cylindrical. 3. Plane wavefront : If the source of light is at very large distance then the shape of            ...