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CBSE NOTES CLASS 12 PHYSICS

CHAPTER 10 WAVE OPTICS

Newton’s corpuscular theory

Wave theory - nature of electromagnetic waves

Wave front

Huygens principle

Refraction of a plane wave from rarer to denser medium

Refraction of a plane wave from denser to rarer medium

Reflection of a plane wave by a plane surface

Behaviour of a plane wave front with different surfaces

The Doppler effect

Superposition principle

Coherent sources of light

Interference of light

Young’s double slit experiment

Fringe width in double slit experiment

Diffraction of light

Single slit experiment

Double slit vs single slit patterns

Interference vs diffraction due to single slit

Constraints for diffraction due to single slit

Viewing the diffraction pattern

Energy is conserved during interference and diffraction

When can we consider the light beam to be parallel beam in single slit experiment?

Resolving power of an objective lens

Fresnel distance

Polarisation

Polarisation by transmission

Polarisation by scattering

Polarisation by reflection - Brewster’s law

Law of Malus

Polaroid and uses of polaroids

CBSE NOTES CLASS 12 PHYSICS

CHAPTER 10 WAVE OPTICS

Wave front

A wave front is defined as the continuous locus of all the particles of a medium, which are vibrating in the same phase. It can be defined as a surface of constant phases.

  1. Spherical wave front: It is wave front created by a point source. The locus of all the points which are vibrating in same phase lies on the surface of the sphere, of which at the centre, the point source is situated

  2. Cylindrical wave front: When the source of light is linear in shape then the locus of all the points which are equidistant from the linear source lie on a cylinder and the wave front formed is called cylindrical wave front.

  3. Plane wave front: It is small part of a big spherical or cylindrical wave front of which, the source of light is at a large distance from the wave front.

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