3. Aims Show that light can be reflected, refracted, diffracted and produces interference effects Explain that we think sound is a wave Show that light can be reflected and refracted
4. Light When light interacts with an object it can be either reflected (bounce off), transmitted (go through) or be absorbed (transfer energy)
6. I think a light ray is a stream of tiny particles emitted by a source My experiment show that light rays can interfere. Two streams of particles could not do this. Light is a wave.
7. Reflection Refraction Reflection is the change in direction of a wavefront at an interface Refraction is the change in direction of a wave due to a change in its speed. Diffraction Interference Interference is the addition of two or morewaves that results in a new wave pattern. Diffraction is the apparent bending of waves around small obstacles and the spreading out of waves past small openings.
14. Reproducing Young’s double slit experiment We are going to repeat Young’s experiment and derive a value for the wavelength of the laser light and compare with the printed value You first need to make your ‘double slit’
15. What will happen? Sketch what you see with no card Sketch what you think you will see with the card Sketch what you actually see Why do you think this happens?
