Laws of Refraction of light class 10 | cbse24

The phenomenon of refraction of light obeys the following two laws.

1:First law :-The incident ray, the refracted ray and the normal to the interface at the point of incident all lie in the some plane.

Example:-AO(incident ray ) OB(Refracted ray) and normal NN' all lie in the same plane(which is the plane of the paper)

2:Second law:
The ratio of sin of the angle of incidence and the sin of the angle of refraction is constant for a given pair of media.

Where μ is refractive index of second medium with respect of first medium

Refraction index in terms of speed of light:-

Refractive index of a medium with respect to vacuum is also called absolute refractive index

Factor on which the refractive index of a medium depends

1:Nature of the medium

2:Wavelength of the medium


4:Nature of the surrounding medium

  •    mean refractive index of medium 2 with respect to medium 1
  •   mean refractive index of medium 1 with respect to medium2
  • A substance having higher refractive index is optically denser than another substance having lower refractive index.μ↑ than density ↑


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