A boundary separates transparent plastic from air. Light passes into the air only when the angle labelled $\theta$ in the diagram is larger than $36^{\circ}$. What is the refractive index of the plastic?
- A0.59
- B0.81
- C1.2
- D1.7
Physics 0625 · IGCSE · Light
A boundary separates transparent plastic from air. Light passes into the air only when the angle labelled $\theta$ in the diagram is larger than $36^{\circ}$. What is the refractive index of the plastic?