quickly as light, and sound needs a Exploring: Pinhole cameras straight lines. medium through which to travel but Ask students to investigate how the light does not. size and number of holes in a pinhole State the meaning of transverse wave camera affects the image. and recall that light waves are transverse waves. Explaining: Straight lines 1 Securing Demonstrate that light travels in Compare longitudinal and transverse straight lines. In a darkened room waves. shine a beam of light onto a wall. Puff Represent the path of light as straight some talcum powder into the beam. lines with arrows on diagrams and The powder dust should illuminate describe how you can demonstrate the beam of light more clearly. that light travels in straight lines. Use a ray diagram to explain how Plenary: Thinking about light shadows are formed and to explain Consider All Possibilities: You cannot image formation in pinhole cameras. see an object in a room. (Possible Exceeding answers: there is no light in the Use ray diagrams to model and explain room; you are not facing the object; the effect of hole size on the image there is an opaque screen between formed by a pinhole camera. you and the object; there is light in Use a model to explain the effect of the room but none of it is shining various factors on shadow size. on the object.) Lesson 8Jb: Reflection Learning objectives Exemplar teaching activities Differentiation Resources Maths skills Practical skills Developing Starter: Using mirrors Exploring: Make Resources Measuring Students design State the meaning of: reflect, scatter, Ask students to think of as many uses a periscope from 8Jb angles. their own transmit, absorb, reflection, angle of of mirrors as they can. Then ask Ask students to Exploring periscope using incidence, angle of reflection, normal, them to explain why the mirror is draw a ray Science. their plane mirror. useful in each case. diagram to knowledge of Describe some uses of plane mirrors. explain how their mirrors and Describe the difference between even Exploring: Make a periscope periscope works. reflection. reflection and scattering, and recall the Ask students if they know what a law of reflection. periscope is, and to suggest some Demonstrate Use the ray model of light to explain uses for it. Then ask students the various how we see things that are not sources to design their own periscope using properties of an
quickly as light, and sound needs a medium through which to travel but light does not. State the meaning of transverse wave and recall that light waves are transverse waves. Securing Compare longitudinal and transverse waves. Represent the path of light as straight lines with arrows on diagrams and describe how you can demonstrate that light travels in straight lines. Use a ray diagram to explain how shadows are formed and to explain image formation in pinhole cameras. Exceeding Use ray diagrams to model and explain the effect of hole size on the image formed by a pinhole camera. Use a model to explain the effect of various factors on shadow size. Exploring: Pinhole cameras Ask students to investigate how the size and number of holes in a pinhole camera affects the image. Explaining: Straight lines 1 Demonstrate that light travels in straight lines. In a darkened room shine a beam of light onto a wall. Puff some talcum powder into the beam. The powder dust should illuminate the beam of light more clearly. Plenary: Thinking about light Consider All Possibilities: You cannot see an object in a room. (Possible answers: there is no light in the room; you are not facing the object; there is an opaque screen between you and the object; there is light in the room but none of it is shining on the object.) straight lines. Lesson 8Jb: Reflection Learning objectives Exemplar teaching activities Differentiation Resources Maths skills Practical skills Developing State the meaning of: reflect, scatter, transmit, absorb, reflection, angle of incidence, angle of reflection, normal, plane mirror. Describe some uses of plane mirrors. Describe the difference between even reflection and scattering, and recall the law of reflection. Use the ray model of light to explain how we see things that are not sources Starter: Using mirrors Ask students to think of as many uses of mirrors as they can. Then ask them to explain why the mirror is useful in each case. Exploring: Make a periscope Ask students if they know what a periscope is, and to suggest some uses for it. Then ask students to design their own periscope using Exploring: Make a periscope Ask students to draw a ray diagram to explain how their periscope works. Resources from 8Jb Exploring Science. Measuring angles. Students design their own periscope using their knowledge of mirrors and reflection. Demonstrate the various properties of an
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