Question

explain refractive index?​

Answer 1

Answer:

• Refractive index is defined as the ratio of the speed of light in a vacuum to its speed in a specific medium.

• Refractive index has the large number of applications. It is mostly applied for identify a particular substance, confirm its purity, or measure its concentration. Generally it is used to measure the concentration of a solute in an aqueous solution.
• It is a number that indicates the number of times slower than a light wave would be in the material than it is in a vacuum. The refractive index, represented by symbol n, is the velocity of light in vacuum divided by the velocity of light in a medium. The formula of the refractive index is as

$n = c/ v$

n is the refractive index

c is the velocity of light in a vacuum ( 3 × 108 m/s)

v is the velocity of light in a substance

• The phase velocity is the speed at which the crests or the phase of the wave moves, which may be different from the group velocity, the speed at which the pulse of light or the envelope of the wave moves

• The highest refractive index is of Diamond with its value 2.42.
• 2.42.Refractive index of glass is 1.5.
• 1.5.Refractive index of water is 1.33.
• 1.33.Refractive index of ruby is 1.77.

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