Define refractive index,

1.	Define refractive index,
Answer» Refractive index (n) :- is defined as the ratio of speed of light in air to the speed of light in medium Refractive index is a physical value which gives us a measure of ratio of speed of light in m1 to speed of light in m2 The ratio between the speed of light in medium to speed in a vacuum is the refractive index. When light travels in medium other than the vacuum, the atoms of that medium continually absorb and re-emit the particles of light, slowing down the speed light.The formula of the refractive index is as follows:\xa0n=c / vWhere,\xa0n is the refractive indexc is the velocity of light in a vacuum ( 3 × 108 m/s)v is the velocity of light in a substance

Discussion