Monday, 25 September 2017

REFRACTION OF LIGHT

When light passes from one medium to another medium, its velocity changes. Due to change in velocity a ray of light is deviated from its path when it falls on the surface of second medium obliquely. This phenomenon is called "REFRACTION OF LIGHT". 

when ray of light inters a denser medium from a rarer medium,  bends towards the normal whereas it bends away from the normal when it enters a rarer medium from denser medium.




LAWS OF REFRACTION :

There are two laws of refraction 

1- The incident ray, the refracted ray and the normal at the point of incidence lie in the same plane. 

2- The ratio of the sine of angle of incidence to the sine of angle of refraction is a constant for any two given media and for the same colour of light. This constant ratio is called the "refractive index "of the second medium with respect to the first medium. The second law of refraction is also called "snell's law".

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