The interference of light waves produces the colors reflected from a cd, the iridescence of bird feathers, and the technology underlying supermarket checkout scanners and optical computers. This page contains the pdf download link of the chapter wave optics followed by the renowned coaching institutes of kota. All lasers should be handled with care, and you should never look directly into the beam. Law of refraction revised c l f since c is constant wavelength, l n, and velocity of light, v n, are changing in medium but frequence, f, stays unchanged. Interference is the process in which two waves combine together and the resultant wave may have a greater or smaller amplitude. The properties of prisms, mirrors, and lenses are best understood in terms of light rays. And so now we turn to a study of the wave nature of light and to the fascinating phenomena of interference, diffraction, and polarizationand of such devices as gratings and thinfilm coatings. Colors such as these are direct evidence of the wave character of light.
Free question bank for 12th class physics wave optics wave optics conceptual problems. Note that the observed laws of geometric optics follow from the assumption that light is a wave. But we had learnt all waves have common characteristic properties such as. Engineering physics unit iphysical optics sv college of engineering, kadapa dr. Here we are providing allen institute wave optics class notes pdf for jee main 2018 exam. Wave optics describes the connection between waves and rays of light. Constructive and destructive interference result from the interaction of waves that are correlated or coherent with each other, either because they come from the same source or because they have the same or nearly the same frequency. Chapter 27, wave optics all interference associated with light waves arises when the electromagnetic fields that constitute the individual waves combine two conditions for sustained interference between two sources of light. Mar 05, 2019 cbse class 12 physics chapter 10 wave optics notes in pdf are available for free download in mycbseguide mobile app.
According to huygens wave theory, each point on the wave front is to be considered as a source of secondary wavelets. Pdf this book was devoted to a discussion and study. Because light is a wave, the superposition principle is valid to determine the constructive and destructive interferences for light waves. Wave theory of light by huygens, fresnel, young, etc in geometric optics we learnt light is a stream of straightgoing particles newton proposed that first then we learnt light is a form of em wave. The best app for cbse students now provides wave optics class 12 notes latest chapter wise notes for quick preparation of cbse board exams and. Jan 24, 2018 in this video i have explained coherent source and noncoherent sources constructive interference amd destructive interference derivation. Then you come to the chapter on wave optics, and you are told that light travels as a wave, that it can bend around objects, it can diffract and interfere, etc. Jan 22, 2020 free pdf download of cbse physics multiple choice questions for class 12 with answers chapter 10 wave optics. Wave optics constitutes a basis for describing a host of optical phenomena that fall outside the confines of ray optics, including interference and diffraction, as demonstrated here. State two conditions to obtain sustained interference of light. According to wave theory of light, the light is a form of energy which travels through a medium in the form of transverse wave motion. Here v 1 and v 2 are the speed of light in media 1 and 2 with refractive index pp 12 and respectively. For the formation of interference pattern, two coherent light.
Ncert solutions for class 12 physics chapter 10 wave optics. Double slit is very important because it is evidence of waves. The setup consists of a plane wave passing through two very narrow. This phenomena of redistribution of energy due to superposition of waves is called interference of light waves.
Class 12 physics revision notes for chapter 10 wave optics. Wave optics, also referred to as physical optics, is the branch of optics that enables important phenomena such as interference, diffraction, and polarization to be understood. Solutions as well as offline apps are based on latest ncert books issued for 202021. Interference in light waves is not easy to observe because the wavelengths are so short.
Define constructive interference for a double slit and destructive interference for a double slit. Wave optics class 12 notes physics mycbseguide cbse. Download pdf wave optics kota study material for iitjee. Physics mcqs for class 12 chapter wise with answers pdf download was prepared based on latest exam pattern.
Cbse class 12 physics chapter 10 wave optics notes in pdf are available for free download in mycbseguide mobile app. Under many circumstances, light exhibits the same behavior as sound or water waves. The frequency remains the same as light travels from one medium to another. In 1679, christian huygens proposed the wave theory of light. Destructive interference the waves are reaching at a point are in out of phase destructive interference occurs. Suppose if the crest of one wave falls on the trough of another wave, then the amplitude here is minimum.
Students can solve ncert class 12 physics wave optics mcqs pdf with answers to know their preparation level. One way to study this is to do a doubleslit experiment. This description works well for many phenomena, including image. We shall see that interference occurs when two or more light waves pass through the. Allen institute wave optics class notes pdf for jee main. It is divided into constructive and destructive interference. The speed of light in a medium depends upon the nature of medium. Here in chapter 37 and in the next chapter, we are concerned with wave optics or physical optics, the study of inter ference, diffraction, and polarization of light. The wave optics class notes pdf is the compilation of detailed theory part, solved examples. The speed v of a wave is given by v t o where is the wavelength of the wave and t 1 is the period of oscillation. Introduction for many purposes, you can consider light to propagate as rays, explaining phenomena. The package consists of brief and to the point theory discussion, good number of solved illustrations and then a set of unsolved problems of various types for practice and also includes previous years asked problems in jee mains and advanced.
Ray optics is based on rectilinear propagation of light, and deals with mirrors, lenses, reflection, refraction, etc. Every one of us uses the camera to click photographs, we use sunglasses when we walk out of our house during daytime, also in our car, we have a mirror of a film. The study of light as a wave is called wave optics. In these waves and optics notes pdf, you will study the concepts of waves and optics learnt at school from a more advanced perspective and goes on to build new concepts. The wave optics class notes pdf is the compilation of detailed theory part, solved examples, hc verma questions and previous year questions. If you want, you can consider this plane wave to be generated plane wave wall figure 1 by a point source that is located a very large distance to the left of the wall. The alternative method of producing interference, by division of. Free pdf download of cbse physics multiple choice questions for class 12 with answers chapter 10 wave optics. When two light waves of the same frequency with zero initial phase difference or constant phase difference superimpose over each other, then the resultant amplitude in the region of superimposition is different from the amplitude of individual. Physics notes for class 12 chapter 10 wave optics wave optics describes the connection between waves and rays of light.
We see that the wave has a maximum amplitude when sin. Spatial coherence is important if different parts of a wavefront are to interfere such as for. In 1801, british physicist thomas young showed experimentally by interference experiment that light also has wave nature and thus wave optics came into existence. They must maintain a constant phase with respect to each other. Wavefront of a wave, at any instant, is defined as the locus of all the particles in the medium which are being disturbed at the same instant of time and are in the same phase of vibration. It explains reflection, refraction, dispersion, double refraction, diffraction, interference, and polarization properties of light. Wave optics 03 ii interfernce of waves i coherent sources i. With wave opticscommonly referred to as physical opticswe are able to account for important phenomena such as interference, diffraction, and polarization. These video tutorials along with short notes will teach you the basics of wave theory of light or wave optics, huygens principle and wave theories of reflection, refraction, superposition and interference, diffraction, and polarization etc for cbse, iitjee, medical entrance and various state board exams preparation. In this video i have explained coherent source and noncoherent sources constructive interference amd destructive interference derivation. In 1678, huygens gave the wave theory of light but it was not primarily accepted because of newtons corpuscles theory of light. It explains reflection, refraction, dispersion, double refraction, diffraction, interference. You will use this property to calculate properties of light. Wave front of a wave, at any instant, is defined as the locus of all the particles in the medium which are being disturbed at the same instant of time and are in the same phase of vibration.
In our discussions of geometric optics we completely ignored the fact that light can also behave as an. If light is a wave, interference effects will be seen, where one part of a wave front can interact with another part. According to wave theory of light, the light is a form of energy which travels through a medium in the form of. Wave optics fundamentals of photonics wiley online library. According to the superposition principle, the net displacement is simply given by the. For any question u can ask in comment follow me on insta. Here the waves do not have the same displacement and the waves are out of phase. Chapter 36 interference of light waves wave optics is a study of. The consequences of these simple postulates are many and far reaching. Only wave optics leads to the correct interpretation of such patterns. These phenomena cannot be adequately explained with the ray optics used in. Interference of light waves and youngs experiment emedicalprep.
Introduction in previous optics labs we have described the properties of light simply in terms of rays, using the laws of reflection and refraction. In physics, interference is a phenomenon in which two waves superpose to form a resultant wave of greater, lower, or the same amplitude. Question bank for 12th class physics wave optics wave optics. These phenomena cannot be adequately explained with the ray optics used in chapters 35 and 36. Interference superposition of waves in same direction graphical and mathematical phase and pathlength difference application to thin. Please do not touch any of the optic surfaces to avoid scratches and fingerprints.
Ncert solutions for class 12 physics chapter 10 wave optics chapter end exercises with solutions and additional exercises solutions in pdf form free download updated for new academic session 20202021. Download cbse notes, neet notes, engineering notes, mba notes and a lot more from our website and app. Download wave optics class notes pdf free of cost from below and share the post. In constructive interference, the amplitude of the resultant wave at a given. All these are nothing but the applications of the wave optics. Lecture notes optics pdf 57p this note covers the following topics.