Questions on colour

Q6. A ray of blue light falls on a glass prism as shown in the diagram.

(a) On the diagram, draw the path of the blue ray through the prism and from the prism to the screen. Use a ruler.

2 marks

(b) The blue ray is replaced by a ray of white light.

(i) What would you now see on the screen?

a spectrum

1 mark

A red filter is placed between the prism and the screen.

(ii) What would you now see on the screen?

Nothing - no light would get through to the screen

(iii) Explain how the red filter causes the change.

A red filter would absorb all of the blue light.

2 marks

Maximum 5 marks