Light YEAR 10

Question 1

Reflection from a FLAT SURFACE is called

Answer 1

Specular

Question 2

Reflection from a ROUGH SURFACE is

Answer 2

Diffuse reflection

Question 3

What determines the colour of an object we see

Answer 3

The ‘colour’ of an object is the wavelengths of light that it reflects

Question 4

What is a black body source

Answer 4

A perfect absorber and emitter of EM waves

Question 5

What happens to a perfect absorber when it is hit with EM waves

Answer 5

The EM waves are NOT reflected, so they are absorbed
This gives the particles more kinetic energy, heating the object

Question 6

what do the primary colours of light mix to make

Answer 6

white

Question 7

What are virtual images in reflection?

Answer 7

Images we can only see when we look through a lens

Question 8

Albedo definition

Answer 8

The whiteness of a surface
ie- the amount of light it reflects

Question 9

Why are black objects absorbers

Answer 9

A black object absorbs all wavelengths of light and reflects none and that’s why it appears black