Light-how do we see
Pg 4-9, teaching approaches
Seeing beams of light
ask students how they see by lettting them draw an object on a piece of paper.
from their responses, bring in the concept that light from from the object enters the eye and enables us see it not vice versa
Before the acivity:
desbrbe it to the students before carrying out the demonstration explaining ensuring what the apparatus are for
inform them that the lights will be turned off during the activity. Provoke their thinking by asking them to predict what they will see when the lights are off
switch on beam with a big effect watch out for their reaction as a red spot appears on the screen but not the beam
explain why the beam is not being seen, light from the beam is not entering the eyes.
ask for eg. Where they have seen beams of light and link it to scattering of light
Recoup the lesson by reinforcing the concept of seeing the red spot on screen because laser light is reflected and some enters the eye.
how light travels
follow up questions