Week 8 Term 3 Two Point Source Interference

  Homework:

Basic Properties of Waves

• Act 5A, p,53, Pulses and Waves
• Ex 3D, p.66--67, Wave Properties

Superposition & Diffraction

• Ex 3F, p.3F, p.73-75 Superposition
• Act 5B, p. 58, Reflection, Refraction and Diffraction of Waves
• Act 5C, p.63-64, Diffraction and Superposition
• Ex 3E, p.69-70, Diffration
• Ex 3H, p.81-83 Waves on a String
• Ex 3I, p.85-87 Wave Refraction on a String

Young’s Double Slit Experiment

• Ex 3B, p. 47-52, Refraction
• Ex 3G, p.76-78 Two Point Source Interference

Reflection, Refraction and Diffraction

• Act 5B, p. 58, Reflection, Refraction and Diffraction of Waves

Diffraction

Diffraction of Water Waves in a Ripple Tank

Two Point Source Interference

Two Point Source Interference

Double Slit Experiment

PhET Sound Wave Interference - link

PhET Wave Interference - link HTML

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

Refraction Bending Light PhET Application

Snell's Law

• 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?