Light in air strikes a water surface. Water has a refractive index of $1.3$, and the angle of refraction in the water is $40^\circ$. What is the angle of incidence in air?
- A$30^\circ$
- B$50^\circ$
- C$52^\circ$
- D$57^\circ$
Physics 5054 · O Level · Refraction of light