Physics for IGCSE & O level - Rays And Waves (Section 4 - No. 34)

If the refractive index is 1.5, and the angle of incidence is 30 degrees, what is the angle of refraction?

19.5 degrees

45 degrees

60 degrees

0 degrees

Using Snell's Law, sin(30)/sin(r) = 1.5, therefore r = arcsin(sin(30)/1.5) which is approximately 19.5 degrees