Light

By the end of the topic, you should be able to

Recall the properties of images formed by plane mirrors.
Draw ray diagrams and use equations to find the position, size and nature of images formed by curved mirrors.
Use either Descartes' or Newton's method for solving mirror problems.
Define refractive index and relate this to the speed and wavelength of light.
Use Snell's Law to solve refraction problems which involve a change in direction.
Describe and identify apparent depth.
Explain the concept of total internal reflection.
- Define and calculate the critical angle.
Explain dispersion of white light.
Draw ray diagrams and equations to find the position, size and nature of images formed by lenses.
- Identify when a lens has a negative focal length.
- Use either Descartes' or Newton's method for solving lens problems.

TED-Ed 4 minutes

4 minutes

1 minute

3 minutes

SciPad p.12 - recap from Year 09

4 minutes

Distinguish between light rays and light waves.
State the law of reflection and show with appropriate drawings how it applies to light rays at plane and spherical surfaces.
SciPad p.18-21

11 minutes - important basic terminology

The image is virtual and upright.

The image is of the same size as that of the object, i.e., magnification = 1.

The distance of the object from the mirror (object distance, o) is the same as that of the image from the mirror (image distance, i).

Hence, the plane mirror equation is: i = o

10 minutes

5 minutes

Refraction - SciPad p. 36-37 and p.40
Refractive Index - SciPad p.38-39 and 41-42
Total Reflection and critical angle - SciPad p. 43, 44,-45 (experimental demos) and p. 46-47
Apparent Depth - SciPad p. 48-52 (how to draw the ray diagram)
Dispersion - SciPad p.53-54