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Questions on Light

Q8. A teacher shines a laser beam onto a classroom window. It reflects off the window and onto a screen.

(a) On the diagram below, continue the laser beam to show its path as it reflects off the window and onto the screen. Use a ruler. Add arrows to show the direction of the laser beam.

See diagram

  • the angles of incidence and reflection must be equal
  • the rays must be continuous and straight with an arrow in the correct direction

2 marks

(b) When a pupil plays her flute in the classroom the window vibrates. When the window vibrates, what happens to the laser beam that is reflected off the window?

The beam will vibrate or jump about

1 mark

maximum 3 marks