SP5 - Light And Electromagnetic Spectrum

Question 1

When do you see luminous objects?

Answer 1

• when light enters your eyes

Question 2

When do you see non-luminous objects?

Answer 2

• because they reflect light

Question 3

Diffuses reflection

Answer 3

• materials with rough surfaces

- reflected light is scattered in all directions

Question 4

Specular reflection

Answer 4

• very smooth surfaces

- reflect light evenly

Question 5

White light hits a colour surface

Answer 5

• colours that make up the colour of the surface are absorbed and some are reflected.

Question 6

What is a lens?

Answer 6

• piece of transparent material shaped to refract light in particular ways.
• power of lens describes how much it bends light.

Question 7

Converging lens

Answer 7

• fatter in the middle

- makes parallel rays of light converge at a focal point

Question 8

Diverging lens

Answer 8

• thinner in the middle

- focal point is point from which the rays seem to be coming after passing through.

Question 9

Virtual image

Answer 9

• object close to a converging lens
• cannot be projected onto a screen
• image appears on the same side of the lens as the object
• is upright and magnified