Light goes from flint glass into ethanol. the angle of refraction in the ethanol is 25.6 ◦ , the index of refraction for flint glass is 1.61, and the index of refraction for ethanol is 1.36. what is the angle of incidence in the glass? answer in units of ◦ .

Snell's law gives the relationship between the angle of incidence and the angle of refraction:

where
is the refractive index of the first medium
is the refractive index of the second medium
is the angle of incidence
is the angle of refraction

In our problem, 



So if we re-arrange Snell's law and we use these data, we can find the angle of incidence:

which gives 

19 hertz bruh u trippin? ?