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Absolute and Relative Refractive Index

What is the f...

Question

What is the formula for refractive index?

A

n =

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B

n =

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C

n =

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D

None of these

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Solution

The correct option is A
n =

Refractive index is defined as, n = $\frac{S p e e d o f l i g h t i n v a c u u m}{S p e e d o f l i g h t i n t h e m e d i u m}$ where, n is the refractive index of the medium. Speed of light in vacuum = 3 $\times 10^{8}$ m/s.

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Q. Define refraction of light waves.
Draw a ray diagram for refraction at a spherical separating two media. For refraction at a spherical surface, derive the relation

\frac{n_{2}}{v} - \frac{n_{1}}{u} = \frac{n_{2} - n_{1}}{R}

in object distance

(u)

, image distance

(v)

, refractive index of media

(n_{1}, n_{2})

and radius of curvature

(R)

Q. When a light rays enters a medium with refractive index

n_{2}

from a medium with refractive index

n_{1}

at curved interface with radius of curvature

R

\frac{n_{2}}{V} - \frac{n_{1}}{U} = \frac{n_{2} - n_{1}}{R}

Now assume that the surface is plane and rewrite the formula with suitable changes.

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