Index Of Refraction Essay
Telescopes are used everyday to view distant or far objects, they produce an image bigger than what can be seen with the unaided eye. To do this, telescopes must gather in a lot more light so that dull objects can be more visible and can be observed in greater detail.
Refraction is due to light changing speed when moving from different mediums. Light rays travel through different substances at different speeds. The index of refraction is the speed of light that is inside of a vacuum (its maximum speed) divided by speed of light in the medium.
For example; the index of refraction for air is 1.0003 and the index of refraction is 1.3 for water. This is why objects can often appear ‘bent’ when crossing between different mediums as the greater the index of refraction, the more light is slowed by the substance.
Examples: Substance Index of Refraction
Vacuum 1
Air 1.0003
Water 1.3
Ethyl alcohol 1.4
Ice 1.3
Glass. 1.5
Diamond 2.4
On a light ray, the angle of incidence will help determine the angle of refraction. There is a intercept point as shown below where the two mediums and the normal meet. The angle between the incidence ray and the normal is the angle of incidence and
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