Physics Class 12 Notes - Class 12th Physics Notes & Questions
About Physics class 12 Notes Topics of Physics class 12 notes are interesting and need good study material to excel. Conceptual understanding can be increased by solving numerical. Optics is one of the important chapters and you will learn There is nothing in its fundamental nature that distinguishes light from any other electromagnetic wave. What distinguishes light from other electromagnetic waves is that we have receptor (eyes) that are sensitive to electromagnetic radiation only in a narrow range of wavelength from about 400 nm (violet) to about 700 nm (red). We will treat light as wave motion in the context of interference and diffraction, but as a stream of photons while explaining the photoelectric effect. Huygen’s Wave Theory. (i)
Each point on a wavefront acts as a source of new disturbances and emits its own set of spherical waves called secondary wavelets. The secondary wavelets travel in all directions with the velocity of light so long as they move in the same medium.
(ii)
The envelope or the locus of these wavelets in the forward direction gives the position of new wavefront at any subsequent time.
(A surface on which the wave disturbance is in the same phase at all points is called a wavefront) Wave optics involves effects that depend on the wave nature of light. In fact, it is from interference and diffraction experiments that we obtain proof that light behaves (at least in these circumstances) like a wave rather than a stream of particles (as Newton believed).