Homework
- Ex 3I, p.85-87 Wave Refraction on a String
- Ex 3B, p. 47-52, Refraction
Snell's Law & Critical Angle
The Critical Angle occurs when a wave is attempting to pass from a medium with a slower speed to that of a higher speed
low v → higher v
low 𝜆 → higher 𝜆
high n → lower n
The Critical angle is the incident angle where the refracted angle equals 90 degrees
- Any incident above the Critical angle will prevent any refraction occuring and Total Internal Reflection will occur
- The Critical angle is can be found by sin(𝜭c) = n2/n1
FibreOptic Cables: How they work?
Total Internal Reflection T.I.R.
What Happens to Lazers Underwater?
