Refraction Of Light

Description:

When a monochromatic ray of light travels from one transparent medium into another transparent medium, its velocity and direction changes. This phenomenon is called refraction of light.

When a ray of monochromatic light is incident obliquely on the interface of two media, part of the light is reflected into the same medium, some part of light is absorbed due to absorption the intensity of light decreases. The remaining part of light is transmitted in the second medium.

Refractive index

Strength of the medium to decrease the velocity of light is known as refractive index of that medium.

Refractive index of a medium is given by −