If the critical angle of for the internal reflection inside a certain transparent material is found to be 48 degrees. What is the index of refraction of the material. (Air is outside the material refractive index of air=1.00)

You are waiting in line to use the diving board at your local pool.while watching people dive into the pool from the board,you realize that using a diving board to spring into the air before a dive is good example newton's third law of motion.explain how a diving board illustrated newton's law of motion