Question

Question #da685

Answer 1

The answer is a .

As a ray of light enters a denser medium, like glass, its speed is reduced by a factor that is called the refraction index `n_"glass"`

Every material has its own refraction index. Water has 1.33, normal (pane) glass is around 1.5, and diamond has 2.4.

Snellius found that the proportion of the sines of the angle of incidence and the angle of refraction is constant and equal to the inverse proportion between de refractive indices of the two mediums.

In formula:

`(sin i)/(sin r)=n_r/n_i =n_"glass"/n_"air"`

`n_"air"` is very near to 1 and `n_"glass"` can be taken as 1.5

`(sin i)/(sin r)=1.5`

Since sines are not proportional to the angles that they 'belong to', the angles are not proportional, even though the sines are.