# How do you calculate the absolute index of refraction?

The refractive index of a light beam traveling from air to a specific medium or from a medium to air is known as the absolute refractive index.

So, using Snell's law (for a ray moving from air to a medium), we do as follows:

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The absolute index of refraction is calculated using the formula:

Absolute Index of Refraction = Speed of Light in Vacuum / Speed of Light in Medium

Mathematically:

[ n = \frac{c}{v} ]

where:

- ( n ) is the absolute index of refraction,
- ( c ) is the speed of light in vacuum (approximately ( 3.00 \times 10^8 ) m/s),
- ( v ) is the speed of light in the medium.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

- Two plane mirrors are inclined at an angle #theta# . Light ray is incident parallel to one of the mirror.For what value of #theta #ray will retrace it's path after third reflection. ?
- What happens to the angle of refraction as the angle of incidence increases?
- Two rays of light are incident normally on a tub of height #H# filled with water. They pass through glass slabs of heights #h_1# and #h_2#. If the speed of light in vacuum is #c#, what is the time difference between the rays of light to reach the bottom?
- What is the angle of refraction if a ray of light passes from water into air at an angle of 30 degrees?
- What is the speed of light in air? in crown glass?

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