Unit 6F: How we see things

Unit 6F: How we see things Unit 6F: Vocabulary Some useful words Opaque Reflect Reflection Light beam Mirror Light travelling A material that light cannot pass through When light ‘bounces’ off a surface in particular shiny surfaces such as mirrors An image viewed in a mirror, for example A thin column of light such as projected by a torch A shiny surface that reflects light Light is always moving V Unit 6F: How we see things

Unit 6F: How does light travel? Unit 6F: How does light travel?: L.O. 1, 2: N.C. 4.3a

Unit 6F: How does light travel? Unit 6F: How does light travel?: L.O. 1, 2: N.C. 4.3a

Unit 6F: How do we see things? Unit 6F: How do we see things?: L.O. 3: N.C. 4.3d

Unit 6F: Reflection: L.O. 4, 5: N.C. 4.3c D Unit 6F: Reflection: L.O. 4, 5: N.C. 4.3c

Unit 6F: Reflection: L.O. 4, 5: N.C. 4.3c D Unit 6F: Reflection: L.O. 4, 5: N.C. 4.3c

Unit 6F: More reflections When light is reflected it’s direction of travel changes angle i = angle r D Unit 6F: More reflections: L.O. 6, 7: N.C. 4.3c

Unit 6F: Shiny and dull surfaces You are going to investigate what types of surfaces reflect light the best, shiny or dull. Test each of the surfaces to record whether it reflects a light beam from a torch and whether you can see yourself in the surface or not. Can you draw any conclusions from your results? Surface Dull or shiny Light reflected from torch I can see my face reflected Mirror Polished metal sheet Sheet of perspex Sheet of paper Piece of polished wood Shiny painted surface Dull painted surface I Unit 6F: Shiny and dull surfaces: L.O. 8, 9: N.C. 4.3c

Unit 6F: Shadow Investigation How can we change the size and position of the shadow? Plan how you are going to investigate this? What will you change Unit 6F: Shadow investigation: L.O. 10, 11, 12, 13: N.C. 4.3b

Unit 6F: Shadow Investigation Shadow Investigation – support slide How can we change the size and position of the shadow? What happens to the size of the shadow when you move the figure nearer to the light? What happens to the shadow when you move the figure further from the light? Does moving the screen have the same effect? Does moving the light make a difference? I Unit 6F: Shadow investigation: L.O. 10, 11, 12, 13: N.C. 4.3b

Unit 6F: Shadow Investigation Shadow Investigation – extension slide Measure the distance between the figure and the screen and the height to the shadow. Record the results in a table Plot your results on a line graph of Distance between figure and screen vs. height of shadow. Are there any patterns in the results you have? Distance between figure and screen Height of shadow Unit 6F: Shadow investigation: L.O. 10, 11, 12, 13: N.C. 4.3b

S Concept Map How we see things Unit 6F: Summary Travels from a source By mirrors In a straight line Object is seen Light Light enters our eyes Reflections Direction of a ray can be indicated by an arrow Shiny surfaces better than dull Direction of beam is changed How we see things Shadows Formed by opaque objects Object nearer light Size can be changed Object nearer surface S Unit 6F: Summary: L.O. 14: N.C.