Week 6 Term 3 2026 Refraction, Wave Equation, Snell's Law, TIR (Totoal Internal Reflection)

 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

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
• Act 7A, p.83-84, Refraction of Light
• Act 7B, p.86, Critical Angle
• Act 7C, p.87, Prisms
• Ex 3B, p. 47-52, Refraction of Light
• Ex 3I, p.85-87 Wave Refraction on a String

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

Refraction Bending Light PhET Application

Snell's Law

FibreOptic Cables: How they work?

Total Internal Reflection T.I.R.

What Happens to Lazers Underwater?

Week 6 Term 3 2024 Two Point Source Interference

 Homework:

Basic Wave Properties

• Act 5A, p,53, Pulses and Waves

• Ex 3D, p.66--67, Wave Properties

• 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

Young’s Double Slit Experiment

• Ex 3B, p. 47-52, Refraction

• Ex 3E, p.69-70, Diffration

• Ex 3G, p.76-78 Two Point Source Interference

• Ex 3H, p.81-83 Waves on a String

• Ex 3I, p.85-87 Wave Refraction on a String

Diffraction

• The Bending of Waves Around Corners
• Larger Wavelength, 𝛌 - greater the angle of diffraction
• Shorter Wavelength, 𝛌 - smaller the angle of diffraction
• Also the smaller the gap the greater the angle of diffraction

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

Cymatics

Cymatics

Cymatics: Hose Pipe Water Experiment

Singing plates - Standing Waves on Chladni plates

Cymatics: Ruben's Tube Vs. Tesla Coil

Sound + Fire = Rubens' Tube

A better description of resonance

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?

Term 2 Week 7 2021

 

• Act 15A, p. 173-176, Particles and Half-Life
• Act 16A, p. 181, Nuclear Reactions
• Act 5A, p,53-54, Pulses and Waves
• Worksheet on Superposition and Reflection
• Act 5B, p. 58, Reflection, Refraction and Diffraction of Waves
• Act 5C, p.63-64, Diffraction and Superposition
• Act 6A, p.69< Plane Mirrors

Diffraction

• The Bending of Waves Around Corners
• Larger Wavelength, 𝛌 - greater the angle of diffraction
• Shorter Wavelength, 𝛌 - smaller the angle of diffraction
• Also the smaller the gap the greater the angle of diffraction

Diffraction

Diffraction of Water Waves in a Ripple Tank

Reflection on A String

Hard Boundary

Wave reflects on opposite side (opposite phase)

Same Amplitude, A

Same Wavelength, 𝛌

Same Wave Speed, v

Reflection on A String

Soft Boundary

Wave reflects on same side (same phase)

Same Amplitude, A

Same Wavelength, 𝛌

Same Wave Speed, v

Refraction on A String

Fast to Slow Boundary

Relation of waves to Incident Wave

Reflected Wave - same speed - same wavelength 𝛌 - opposite phase

Refracted Wave - slower speed - smaller wavelength 𝛌 - same phase

Refraction on A String

Slow to Fast Boundary

Relation of waves to Incident Wave

Reflected Wave - same speed - same wavelength 𝛌 - same phase

Refracted Wave - faster speed - larger wavelength 𝛌 - same phase

Cymatics

Cymatics

Cymatics: Hose Pipe Water Experiment

Singing plates - Standing Waves on Chladni plates

Cymatics: Ruben's Tube Vs. Tesla Coil

Sound + Fire = Rubens' Tube

A better description of resonance

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?

Term 3 Week 1 2017

Homework:

• Ex 3A, 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

Snell's Law

FibreOptic Cables: How they work?