- Introduce reflection using a torch in a darkened room. Ask pupils to predict where reflected rays will go.
- Demonstrate the use of a ray box and slit to produce a thin beam of light. Ask pupils to predict what will happen if the beam shines onto a plane mirror, to record their prediction, and to plan how to investigate their predictions of reflections at such a surface. Point out the need for accurate measurement and show them how to measure angles of light rays with reference to the normal, using a protractor, and to draw a line graph of their results. Through questioning, establish whether the data collected supports the pupils' predictions.
- Ask pupils to find out how infrared remote-control devices work and whether infrared is reflected in a similar way to light.
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- make predictions about the way that light is reflected from plane surfaces
- make and record accurate measurements of angles of incidence and reflection with respect to the normal
- represent the data as a line graph and draw a line of best fit
- make a generalisation,
eg the light is reflected from a plane surface at the same angle at which it hits it
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