A light ray enters a block of plastic and travels along the path shown above.
- By considering the behavior of the ray at point P, determine the speed of light in the plastic.
- Determine what will happen to the light ray when it reaches point Q, using the diagram above to illustrate your conclusion.
- There is an air bubble In the plastic block that happens co be shaped like a plano‑convex lens as shown below. Sketch what happens to parallel rays of light that strike this air bubble. Explain your reasoning.