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Question

What is refraction?


Solution

When the light waves travel frim one medium to another, refraction accurs at the boundary separating the two medium.
* Refraction occurs because velocity of light is different in in different medium.

Refraction is given by snell's law.
M1 Sin i = M2 sin r
M1 and M2 are refractive index of two mediums.
M1=Speed of light in VacuumSpeed of light in Medium 1
M2=Speed of light in VacuumSpeed of light in Medium 2
  If M1>M2,
Then M, is denser medium than M2
And if light goes from 1 to 2 then it will bend away from the normal

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