A light ray falls on the surface of a glass block with an angle of incidence of $45^\circ$. The refractive index of the glass is $1.8$. What is the angle of refraction inside the block?
- A$23^\circ$
- B$25^\circ$
- C$45^\circ$
- D$81^\circ$
Physics 5054 · O Level · Refraction of light