Chapter-10|Wave Optics|NCERT 12th Physics: Diffraction of Light at a Single Slit: A parallel beam of light with a plane wavefront is made to fall on a single slit LN. As LN=a is of the order of wavelength of light, therefore diffraction occurs on passing through the slit. The wavelets from the single wavefront reach the […]
Chapter-10|Wave Optics|NCERT 12th Physics: Diffraction of Light: The phenomenon of bending of light around the sharp corners and the spreading of light within the geometrical Shadow of opaque obstacles is called diffraction of light. Diffraction is more when slit width ‘a’ is smaller than wavelength λ of the light.
Chapter-10|Wave Optics|NCERT 12th Physics: Young’s Double Slit Experiment: The fringes pattern(dark and bright fringes) shows that light has wave nature and bright fringes are result of constructive interference of the two light waves and dark fringes result due to destructive interferences. Let S₁ and S₂ are two very fine slits, at small distance d apart.
Chapter-10|Wave Optics|NCERT 12th Physics: Interference of Light Wave: Interference of light is the phenomenon of redistribution of light energy in a medium on account of superposition of light waves from two coherent sources. Constructive Interference: At the points where the resultant intensity of light is maximum, interference is said to be constructive. Destructive Interference: At
Chapter-10|Wave Optics|NCERT 12th Physics: Superposition Principle: When two or more waves travelling through a medium, superpose on each other, then a new wave is formed in which resultant displacement is equal to to the vector sum of displacement due to individual wave. Coherent Source of Light: Coherent source of light are those source of light
Chapter-10|Wave Optics|NCERT 12th Physics: Doppler’s Effect in Light: The change in frequency or wavelength of the light wave due to the relative motion between the light source and the observer is called Doppler’s Effect. Negative(-) sign indicates source is moving away from observer. When light source moving away from the observer, the frequency received by
Chapter-10|Wave Optics|NCERT 12th Physics: Proof For Law of Refraction at a Plane Surface(By Huygens’ Wave Theory): Let after t time a ray comes from B to D and cover a distance V₁t. Now we will form a wavelet at point D. Now, after t time a wave comes from A to C with speed V₂
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Chapter-10|Wave Optics|NCERT 12th Physics: Proof for laws of Reflection at a Plane Surface (By Huygens’ Wave theory): When parallel rays comes from infinity at any instant a ray touches point A and at that time another ray touches point B, At that time first wavefront AB will be formed and it will be perpendicular to
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Chapter-10|Wave Optics|NCERT 12th Physics: Huygens’ Principle: Huygens’ principle gives the shape of the wavefront at any time and allows us to determine the shape of the wavefront at a latter time. According to Huygens’ Principle (I) Every point on a wavefront acts as source of secondary disturbances which emits their own wavelets called secondary wavelets.
Chapter-10|Wave Optics|NCERT 12th Physics: According to huygens light is a mechanical wave (require a medium). Huygens supposed the existence of a hypothetical medium called “luminiferous Ether” which filled the entire space through which Sun rays comes on Earth. This medium was supposed to be massless with extremely high elasticity and very low density. Wavefront: A
