A beam of light enters a transparent block. It is refracted inside the block and then reaches the top surface of the block at the critical angle. Which diagram shows the angle of refraction $r$ and the critical angle $c$ correctly?
Physics 0625 · IGCSE · Light
A beam of light enters a transparent block. It is refracted inside the block and then reaches the top surface of the block at the critical angle. Which diagram shows the angle of refraction $r$ and the critical angle $c$ correctly?