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Unit 3: Optics (revised 2012)

Abstract light pattern

Light and Its Properties

Backgrounders

Learn about light and its properties.

Large diamond refracting light

Reflection and Refraction

Backgrounders

Learn about reflection and refraction and meet Emily Altiere, a PhD student in physics who studies lasers.

Boy looking through telescope at night

Optical Telescopes

Backgrounders

Learn about the history of telescopes and the function of refracting and reflecting optical telescopes.

Radio Telescope array at night

Radio Astronomy

Backgrounders

Learn about radio astronomy, a type of astronomy that studies objects in space using radio waves and radio telescopes.

hermographic image a woman’s head and neck

Thermal Imaging

Backgrounders

Learn about uses of thermal imaging as a medical imaging technology.

dental x-ray

Radiography & X-ray Imaging

Backgrounders

Learn about radiography and x-rays as a form of medical imaging technology.

Photo de Alicia Rose Rossi

Alicia Rose Rossi

Career Profiles

Forensic Identification Assistant

Alicia Rose Rossi is a Forensic Identification Assistant for the York Regional Police.
Jasraj Chahal | Ingénieure en contrôle des systèmes

Jasraj Chahal

Career Profiles

Control System Engineer

Jasraj Chahal is a mechanical engineer working in the aerospace industry.
Trevor Roote | Préposé à l'entretien des machines

Trevor Roote

Career Profiles

Mechanical Maintainer

Trevor Roote is a Mechanical Maintainer for Bruce Power.
Adult and children looking through telescope

The Optics of Telescopes

Backgrounders

Learn about telescopes, how they work & why they're important to astronomers.

Two faces each with one eye visible

Why do we need two eyes to see?

Hands-on Activities

Ever wondered why we have two eyes (and not one, three or more)? Find how your two eyes work together in this hands-on activity.

Why is everything so small down there?

Why is everything so small down there?

Hands-on Activities

Explore how we see things far and near and from different angles. It's all about perspective!

Circle of colours

What is white light?

Hands-on Activities

Find out what happens if you spin the colours of the rainbow in this hands-on activity.

A pot of gold at the end of a rainbow

What's in a Rainbow?

STEM Explained

Rainbows are beautiful examples of optics in nature. We see them thanks to the reflection and refraction of visible light and water.

Artist’s interpretation of astronaut in space

What are the Different Types of Radiation?

Backgrounders

Learn about the different types of radiation, how they interact with atoms and how they can affect you.