Draw ray diagrams to describe the Exploring: Investigating lenses on a screen to through refraction of light as it passes into Students use ray boxes to shine parallel illustrate the cylindrical and out of different media. rays of light through cylindrical effect of making converging Describe the effects of convex converging lenses of different light rays lenses of lenses on parallel beams of light. thicknesses and note the results. converge to a different Securing point. The thicknesses and Explain why refraction occurs. Explaining: Lens demonstration relationship note the State the meaning of focal length, Use a ray box with triple slits to show between the results. focus, and principal axis. students how a convex lens affects curvature of the Relate the power of a lens to its light. Then simulate a convex lens using lens and the Use a ray box shape. two narrow prisms (available from distance between with triple Exceeding equipment suppliers) placed base to base the lens and slits to show Describe the effects of concave and using two ray boxes with single slits. screen to achieve students how a lenses on parallel beams of light. Ask students to predict what a concave a focused picture convex lens State the meaning of: total internal lens will do to rays of light. can then be affects light. reflection, critical angle. investigated. Describe some uses of total internal Plenary: Thinking about atoms and reflection such as in optical fibres properties and in binoculars. What Was the Question: bigger. (Possible questions: How does the angle of refraction compare to the angle of incidence when light goes from glass to air? How does the angle of incidence compare to the angle of refraction when light goes from air to water? How does the speed of light in air compare to the speed of light in glass/water?) Lesson 8Jd: Cameras and eyes Learning objectives Exemplar teaching activities Differentiation Resources Maths skills Practical skills Developing Starter: Brainstorm cameras and n/a Resources n/a Students record Recall the primary colours for light. eyes from 8Jd simple images Identify the parts of the eye (including Show students a pinhole camera. Ask Exploring by arranging rods and cones) and state their them to suggest the differences Science. various functions. between the pinhole camera and a translucent and
Draw ray diagrams to describe the refraction of light as it passes into and out of different media. Describe the effects of convex lenses on parallel beams of light. Securing Explain why refraction occurs. State the meaning of focal length, focus, and principal axis. Relate the power of a lens to its shape. Exceeding Describe the effects of concave lenses on parallel beams of light. State the meaning of: total internal reflection, critical angle. Describe some uses of total internal reflection such as in optical fibres and in binoculars. Exploring: Investigating lenses Students use ray boxes to shine parallel rays of light through cylindrical converging lenses of different thicknesses and note the results. Explaining: Lens demonstration Use a ray box with triple slits to show students how a convex lens affects light. Then simulate a convex lens using two narrow prisms (available from equipment suppliers) placed base to base and using two ray boxes with single slits. Ask students to predict what a concave lens will do to rays of light. Plenary: Thinking about atoms and properties What Was the Question: bigger. (Possible questions: How does the angle of refraction compare to the angle of incidence when light goes from glass to air? How does the angle of incidence compare to the angle of refraction when light goes from air to water? How does the speed of light in air compare to the speed of light in glass/water?) on a screen to illustrate the effect of making light rays converge to a point. The relationship between the curvature of the lens and the distance between the lens and screen to achieve a focused picture can then be investigated. through cylindrical converging lenses of different thicknesses and note the results. Use a ray box with triple slits to show students how a convex lens affects light. Lesson 8Jd: Cameras and eyes Learning objectives Exemplar teaching activities Differentiation Resources Maths skills Practical skills Developing Recall the primary colours for light. Identify the parts of the eye (including rods and cones) and state their functions. Starter: Brainstorm cameras and eyes Show students a pinhole camera. Ask them to suggest the differences between the pinhole camera and a n/a Resources from 8Jd Exploring Science. n/a Students record simple images by arranging various translucent and
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