English National Curriculum - Science
Mission Objectives
Construct and interpret ray diagrams for convex and concave lenses
Calculate magnification using the appropriate formula
Explain how lenses form images
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Words and meanings to learn
focal length
the distance from the centre of the lens to the focal point, usually measured in centimetres (cm) or metres (m)
focal point
the point where rays of light parallel to the principal axis either converge (convex) or appear to diverge from (concave) after passing through the lens
concave
a lens that is thinner in the middle than at the edges; it diverges (spreads out) parallel rays of light away from a focal point
convex
a lens that is thicker in the middle than at the edges; it converges (brings together) parallel rays of light to a focal point
real image
an image formed when light rays actually meet at a point after passing through a lens; a real image can be projected onto a screen and is usually inverted
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Lamp boxes with crosses and power supplies
Examples of different types of lens (concave, convex, plano-concave, plano-convex).
Lens stands
Tracing paper
Hand lenses
Graph paper
Converging lenses
Magnifying glasses
Expert film
Mission assignment film
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