Date Lesson2: Reflection Lesson Outcomes How I did Targets Connector: Mirror experiment List examples of situations where mirrors can help people to bring light into dark areas Lesson Outcomes How I did Targets Task 1:Demonstrate and prove that light travels in straight lines Level 5 Task Devise an experiment to test whether there is a relationship between the angle of incidence and the angle of reflection Level 6 Task 3: apply your knowledge of reflection to produce a light tube Level 7 Working in small groups, pupils are given one torch, one sheet of card as a target and a number of mirrors. The challenge is to bounce the beam from the torch from mirror to mirror and so onto the target

BIG picture What skills will you be developing this lesson? Numeracy Team work Independent enquiry How is this lesson relevant to every day life?

New Information for Task 1

Task 1 (Level 5) Task 1: For each experiment, write down an explanation of how the experiment shows that light travels in straight lines. Describe another experiment that you could do to show that light travels in straight lines. Builders use laser beams to check that bricks are laid level. Why might this be better than using a traditional spirit level that uses a bubble in liquid to check for levelness? Soldiers use a laser beam to help aim a rifle. Describe how this can help the accuracy of shooting. Keywords for Task 1: Beam light straight ray focus

Task 1: Answers Experiment 1 shows that light can travel through the rubber tube but not if it bends. Experiment 2 shows that the hole in the card must line up for light to pass through three of them. If it could travel in a curve, it would shine through the other set of holes as well. Experiment 3 shows that light travels in straight lines otherwise it would bend round the card and fill-in the shadow area, and it doesn’t (3) Light beams have no weight and can be used over a very long distance. A spirit level can only be used over small distances and they are often long and heavy. (4)The laser beam produces a spot on the target that can be seen by the soldier. The light travels in a straight line and shows where the bullet will travel to.

How can I improve on task 1? Task 1: Review Go back to your lesson outcome grid and fill out the ‘How I did’ and the ‘Targets’ column. Lesson Outcomes How I did Targets Task 1: Level 5 Met? Partly met? Not met? How can I improve on task 1?

New Information for Task 2

New information task 2

New information task 2 You are going to do an experiment, using the equipment listed above, to confirm or contradict the statement that ‘the angle of reflection is equal to the angle of incidence’. Draw a results table to record you measurements in. This will need to record the incident angle and the reflected angle

New information task 2 Draw a results table to record you measurements in. This will need to record the incident angle and the reflected angle Draw the normal, the position of the mirror and the incident angles accurately on a piece of paper. This should look very similar to the diagram above. Put the mirror along the mirror line on the paper and shine a light ray along one of the incident lines you have drawn. Draw the path of the reflected ray on the paper. Repeat this for all of the incident angles. Now remove the mirror and measure the angle of each reflected ray and record the results in your results table. Notice that the angles are measured between the normal and the light ray.

Task 2 (Level 6) Task 2: Plot a graph of your results and add a straight line of best fit Using your results, write a simple statement describing the link between the angle of reflection and the angle of incidence Keywords for Task 2: incidence Reflection Angle mirror

Task 2: Answers

How can I improve on task 2? Task 2: Review Go back to your lesson outcome grid and fill out the ‘How I did’ and the ‘Targets’ column. Lesson Outcomes How I did Targets Task 2: Level 6 Met? Partly met? Not met? How can I improve on task 2?

New Information for Task 3 Equipment Rolled paper tune Piece of foil Sticky tape Glue stick Piece of A4 paper

Task 3: (Level 7) Keywords for Task 3: reflection ray light tube You are trying to get as much light to the end of the tube as you can. You may only use the equipment provided. You have 5 minutes to plan what you are going to do. You cannot have the equipment until this time is up. You have 10 minutes to produce your light tube. Draw a well labelled sketch of your design, showing the features of your design and how it uses science to get the best results. Task 3: Extension Test all designs using a light meter Keywords for Task 3: reflection ray light tube refract emit detect

Task 3: Answers

How can I improve on task 3? Task 3: Review Go back to your lesson outcome grid and fill out the ‘How I did’ and the ‘Targets’ column. Lesson Outcomes How I did Targets Task 3: Level 7 Met? Partly met? Not met? How can I improve on task 3?

Review Write 2 sentences using the words reflection, image and mirrors.