By suitably heating, suf ficient ther mal ener gy can be imparted to the free electrons to enable them to come out of the metal. This is an important theory in its own right because explorationists often assume that wave propagation in rocks can be approximated by acoustic theory so that they can simplify their data processing algorithms. Physics notes for class 12 chapter 10 wave optics wave optics describes the connection between waves and rays of light. Study material 12th physics wave theory of light 1. Huygens stated that light is made up of waves that vibrates up and down and is perpendicular to the direction of light. Pdf for many early thinkers and natural philosophers, optics was considered the most fundamental of the natural sciences. Ncert books pdf download 2020 for class 12, 11, 10, 9, 8. Other articles where wave theory of light is discussed. Class 12 physics revision notes for chapter 10 wave optics.
An account of some cases of the production of colors not hitherto described. The speed of light in a medium depends upon the nature of medium. Light consists of very tiny, elastic, rigid particles known as corpuscular. Psychology is a multifaceted discipline and includes many subfields of study such areas as human development, sports, health. The physics of waves version date february 15, 2015. Ncert solutions for class 12 physics in pdf format is given below to free download for new academic session 202021 based on latest cbse syllabus. Maharashtra hsc question papers 2020, 2019 download. Measuring amplitude on the oscilloscope and did a report on how it changes because of the pn junction. Newtons laws of motion allen physics particle kinematics allen physics practical physics allen physics rotational motion allen physics temperature scales allen physics wave theory allen physics work energy allen physics this website is created solely for jee aspirants to download pdf, ebooks, study materials for free. Ncert books pdf free download for class 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, and 1 april 14, 2020 by kishen 16 comments there are many books in the market but. Class 12 physics revision notes for chapter 10 wave optics free pdf download. Light and its nature have caused a lot of ink to flow during these last decades. Light is a form of energy that makes object visible to our eyes.
The mode of propagation of energy from one point to another through the vibration of the particles in the medium. This treatise was written during my stay in paris twelve years ago, and in the year 1678 was. Two coherent sources of light were taken in order to maintain the 0 or constant phase difference between the sources of light. Quickly assess your understanding of what light is, and the history of those who worked on the wave theory of light, using this multiple choice quiz and worksheet. For the regular preparation for cbse, iit jee mains and advance, neet, bitsat, ggsipu use latest ncert books available in the market.
Huygens put forward his wave theory according to which light energy propagated in the form of wave, with the help of wave theory he could successfully explain the phenomenon of reflection and refraction, interference and diffraction all. Newton believed that light consisted of a stream of particles, called corpuscles. These corpuscles on emission from the source of light travel in straight line with high velocity when these particles enter the eyes, they produce image of the object or sensation of vision. Phys 201 lecture 18 wave theory of light open yale. This was based on an alternate description of atomism of the time period isaac newton was a pioneer of this theory. We can prove the laws of reflection on the basis of huygenss wave theory as follows. Wave theory of light classroom lecture by pradeep kshetrapal.
Young took an ordinary source of light s such as light bulb. Ncert solutions for class 12 physics in pdf form updated. This spherical surface is called the sphericalwave front at time t. The theory was spread most significantly by robert hooke and christiaan huygens in the 17th century. Youngs double slit experiment shows clearly that light is a wave. On this page you can read or download wave theory of light 12th physics pdf in pdf format. The wave theory and the particle theory of light were long considered to be at odds with. What are some good topics for the class 12 project in biology cbse. When these waves carrying energy reach the eye, they excite the optic nerves and the sensation of vision is produced. If c is the velocity oflight, then after time t each wave will reach thesurface of a sphere of radius ct with centre s. On this page you can read or download wave theory of light 12th physics pdf taget publications in pdf format. Investigate the relation between output and input voltage. In order to observe the wave behavior of light, the slit size and separation should be. By applying a very strong electric field of the order of 108 v m1 to a metal, electrons can be pulled out of the metal, as in a spark plug.
Light energy from a source is propagated in the form of waves. Definition of light before going into the wave theory of light, lets learn about light itself. The topics and subtopics covered in wave optics class 12 notes are. Thomas young, through his double slit experiment, measured the wavelength of light. Wave theory of light 12th physics pdf taget publications. 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. But this concept was not readily accepted and was in contradiction to the particle theory or the corpuscular theory of light proposed by sir isaac newton.
Which travel in all directions with the velocity of light in the medium. The wave theory of light, proposed by dutch physicist christian huygens in 1678, has stood the test of time and is today considered one of the backbones of optics. Students must finish the syllabus at least a month before the board exams and solve the maharashtra 12th question papers. Its dual behavior is partly explained by 1doubleslit experiment of thomas young who represents the photons motion as a wave and also by 2the photoelectric effect in which the photon is considered as a particle. Physics of acoustic wave propagation the theory of acoustic wave propagation is now described. But we had learnt all waves have common characteristic properties such as. Light consists of very small invisible elastic particles which travel in vacuum with a speed of 3 x 10 8 ms. First three chaptersbiographical sketch of huygens. A wave is a vibratory disturbance in a medium which carries energy from one point to another point without any actual movement of the medium. If you dont see any interesting for you, use our search form on bottom v. This theory could explain the phenomena of interference, diffraction, etc.
This is illustrated by the wave model of light and the particle model of light, which together describe the wave particle duality in which light is understood to possess both wave and particle functions. Even more important, though only touched on in this book, is the wave phenomenon of quantum mechanics, built into the fabric of our space and time. A few questions related to these books are given below. Cbse notes class 12 physics wave optics aglasem schools. The founder of physiological optics and father of the wave theory of light, he was also the first person to decipher a. The maharashtra class 12th question papers pdf will be downloaded on your computer mobile phone. Psychology is the scientific study of the mind and behaviour, according to the american psychological association. Wave optics describes the connection between waves and rays of light. Energy can be transferred from one point to another in two different ways. Whether you are going to work in mnc or going to work with usual private firms, it all depends here. To ensure the good marks to students we always stands behind them with all practical and theoretical support on physics investigatory project. According to wave theory of light, a source of light send out disturbance in all. Physics project reports free download cbse students.
Plane wavefront ab, bounded by two rays pa and qb, is. In the given figure, ab is the wavefront incident on a reflecting surface xy with an angle of incidence i as shown in figure. Experiments and calculations relative to physical optics. How can it make sense to use the same word wave for all these disparate phenomena. According to huygens principle, every point on ab acts as a source of secondary wavelets. But, the dutch physicist, christiaan huygens believed that light was made up of waves. Wave theory of light history, huygens propostions and more. As we will see, the wave model could satisfactorily explain the phenomena of r eflection and r efraction. The wave theory of light was proposed by christiaan huygens. The light waves emitted by it travelin all possible directions. Laws of reflection on the basis of huygens wave theory.
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. Physics projects for class 12 gurukul technical institute. Mechanical waves those waves which require a material medium for their propagation, are called mechanical waves, e. Wave theory of light definition of wave theory of light. Know more about these in wave optics class 12 notes. Sir issac newton was a strong advocate of the particle nature of light. Doubleslit interference l02 intensity in doubleslit interference. Prove the laws of refraction and snails law using hygenes wave theory of light consider xy as a plane surface separating two media. Interference is described using real and complex numbers in anticipation of quantum mechanics. In optics, the corpuscular theory of light, arguably set forward by descartes in 1637, states that light is made up of small discrete particles called corpuscles little particles which travel in a straight line with a finite velocity and possess impetus. According to wave theory of light, a source of light sends out disturbance in all directions. In order to observe the wave behavior of light, the slit size and separation should be comparable or smaller than the wavelength of light. 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.
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