Year 9 Science · Unit 4 · Lesson 9

Light Interactions

Foundation Worksheet

Name
Date
Class

Learning Goals

Warm Up

Sort it!

Write each example from the pool into the correct category box. Each example involves mainly one type of light interaction.

Mirror image in a spoon Pencil appears bent in water Black T-shirt heats up in the sun Your reflection in still water Rainbow from a raindrop Dark road surface warms up on a hot day Straw looks bent in a glass of water Light bending through glasses lens White wall scatters light in all directions

Reflection

Refraction

Absorption

Your Turn

True or False? Fix the false ones

Circle T or F for each statement. If the statement is false, rewrite it correctly on the line below.

The angle of incidence is measured from the surface of the mirror, not from the normal.

Correct it:

T
F

Refraction occurs because light changes speed when it moves from one medium to another.

Correct it:

T
F

A red apple reflects red light and also reflects all other colours of white light.

Correct it:

T
F

Total internal reflection is used in optical fibre cables to carry light signals over long distances.

Correct it:

T
F

Show What You Know

1. A ray of light hits a flat mirror at an angle of 35° to the normal. What is the angle of reflection? State the law you used.

Recall 2 marks

2. Explain why a blue object appears blue in white light. What happens to the other colours of white light?

Recall 2 marks

Wrap Up

In one sentence, what was the main idea of this lesson?

HSCScience · Year 9 Science · Unit 4 · Lesson 9 · Foundation Worksheet