Interference
1.) It is due to the superposition of two or more than two wavefronts coming from coherent sources.
2.) The intensity of all bright fringes are same
3.) Interference fringes either of the same size or decrease after moving away from the center.
4.) Dark fringes are usually perfectly dark.
5.) A minimum coherent source is needed.
Diffraction:
1.) It occurs due to secondary wavelets, originating from infinite different points of the same wavefronts.
2.) Central maxima of bright fringe is followed by either side maxima of decreasing intensity.
3.) Interference fringes are never of the same shape and size.
4.) Dark fringes are not perfectly dark.
5.) It is possible by either one or more than one source which need not be coherent.
Angle of Acceptance → If incident angle of light on the core for which the incident angle on the core-cladding interface equals the critical angle then incident angle of light on the core is called the "Angle of Acceptance. Transmission of light when the incident angle is equal to the acceptance angle If the incident angle is greater than the acceptance angle i.e. $\theta_{i}>\theta_{0}$ then the angle of incidence on the core-cladding interface will be less than the critical angle due to which part of the incident light is transmitted into cladding as shown in the figure below Transmission of light when the incident angle is greater than the acceptance angle If the incident angle is less than the acceptance angle i.e. $\theta_{i}<\theta_{0}$ then the angle of incidence on the core-cladding interface will be greater than the critical angle for which total internal reflection takes place inside the core. As shown in the figure below Transmission of lig
Comments
Post a Comment
If you have any doubt. Please let me know.