The speed of light in polythene is 1.99 x 108 m/s What is the index of refraction of polythene
1.51
To determine the index of refraction of a material, you need to know the speed of light in a vacuum and the speed of light in the material in question.
Given that the speed of light in polythene is 1.99 x 10^8 m/s, we can compare it to the speed of light in a vacuum, which is approximately 3 x 10^8 m/s.
The index of refraction (n) can be calculated using the formula:
n = (speed of light in vacuum) / (speed of light in the material)
Plugging in the values for polythene, we get:
n = (3 x 10^8 m/s) / (1.99 x 10^8 m/s)
Simplifying this expression, we find:
n = 1.51
Therefore, the index of refraction of polythene is approximately 1.51.