What is the angle of refraction when a ray of light passes from ethanol to air if the incident angle is 34°? The refractive index of ethanol is 1.36 and of air is 1.00.

21°

34°

49°

66°

Question

What is the angle of refraction when a ray of light passes from ethanol to air if the incident angle is 34°? The refractive index of ethanol is 1.36 and of air is 1.00.

21°

34°

49°

66°

danjs · Answer

Snell's Law: 
The ratio of the sines of the angles of incidence and refraction is equal to the  reciprocal of the ratio of indices of refraction.
$$\frac{ Sin(\theta _{E} )}{ Sin(\theta _{A})}=\frac{ n _{A} }{ n _{E} }$$

3 of the 4 values are given.