Nature of Propagation of Light falls under waves and optics portion of class 12 physics. Nature of Propagation of Light Class 12 Physics Notes is designed according to the updated syllabus of 2080 and it covers all the important portion of the chapter. Students can easily prepare their notes, study for test or exams by taking the help of class 12 Nature of Propagation of Light Notes.
Chapter – 10
Nature of Propagation of Light
Light is a form of energy which creates the sensation of sight and its nature lends the spectacular vividness to the natural world that our senses perceive. The understanding of light itself has been mired in deep historical developments and scientists have made discussion and postulated various theories.
Chapter Overview
In this chapter we are going to learn the following concepts, ideas or topics;
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Newton’s Corpuscular Theory
On the basis of rectilinear propagation of light, Newton in 1675 A.D. proposed that a body emits light in the form of particles called corpuscles. The corpuscles are tiny, light and elant particles. Newton assumed that corpuscles possess fits which allow them easy reflection at ore stage and easy transmission at the other. According to this theory the velocity of light in a denser medium is higher than in a rarer medium. But the experiment result of Foucault and Michelson show that the reverse is true. The phenomena of interference, diffraction etc could not be explained on the basis of the corpuscular theory.
Huygens Wave Theory
This theory was proposed by Dutch scientist Christian Huygens in 1678. According to this theory, a luminous body is a source of disturbance in hypothetical medium called ether. The disturbance from the source is propagated in the form of waves though space and the energy s distributed equally in all directions. When these waves carrying energy are incident on the eye the optical nerves are excited and the sensation of vision is produced. On the basis of this concept, the phenomenon of reflection, refraction, diffraction, interference etc can be explained.
Huygen’s Principle
In 1678, Huygen’s assumed that a source of light emits light in the form of waves. According to him:
