How does light travel?

How can travelling light be represented?

What is the relationship between the speed of light and the speed of sound?

What is a luminous object? Give examples.

What is a non-luminous object? Give examples.

Incident ray

Reflected ray

Normal

The angle of incidence

The angle of reflection

The law of reflection

Refraction

Dispersion

Primary colours

Secondary colours

Explain how coloured objects appear in white light and in different colours of light