Reflection 16/03/2016 cgrahamphysics.com 2016
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1 Reflection
2 What happens to light when it hits a mirror?
3 Reflection Starter: We use our eyes to see. Who s eye am I?
4 Starter Use a mirror to draw a mirror image of your name. When something is reflected in a plane mirror, left becomes right and right becomes left.
5 Key words angle of incidence - angle of reflection Image incident ray plane mirror normal ray diagram
6 Reflection of Light Objectives: Describe some uses of mirrors Draw accurate ray diagrams of how an image is formed by a mirror Recall that the angle of incidence = angle of reflection
7 Reflection of Light Which way will this ray of light go? Why? A B C D Mirror
8 Reflection of Light the angle it comes in at = the angle it goes out at angle of incidence = angle of reflection How do we measure these angles? A B C D Mirror
9 Reflective materials Objects that reflect light well: Have smooth, shiny surfaces and are usually pale colours. Give clear images because they reflect light regularly. Objects that do not reflect light well: Have rough, matt surfaces and are usually dark colours. Give diffuse images (or do not give any images) because they reflect light irregularly. This is called scattering.
10 Think of as many uses of mirrors as you can. Explain why the mirror is important in each case. What is different about the way mirrors reflect light to the reflection of light by other surfaces?
11 What happens to the light which isn t reflected? Some may be absorbed (e.g. as heat). Some may be transmitted (e.g glass reflects a small amount of light, absorbs some of the rest and allows most of it to pass through.)
12 Investigation Investigate how the angle of incidence affects the angle of reflection. Record your results in the table. Angle of incidence (º) Angle of reflection (º)
13 Investigation Draw the symbol for a mirror on your page.
14 Investigation Place your mirror on top of this and shine a ray of light at the mirror. Make sure the mirror is vertical.
15 Investigation Put two crosses on the incident ray and two on the reflected ray.
16 Investigation Remove all the equipment and join the dots up to the mirror using a ruler (remember light travels in straight lines!)
17 Investigation Draw the normal at 90º to the mirror surface and measure the angle of incidence and angle of refraction. Angle of incidence Angle of reflection
18 Investigation Investigate a range of angles of incidence from near 0º to near 90º.
19 Conclusion The angle of incidence is equal to the angle of reflection.
20 Ray diagram for a mirror normal mirror Light travels in straight lines use a ruler! incident ray reflected ray angle of incidence angle of reflection
21 Rules of reflection in plane mirrors 1) The reflected image is the same size of the object 2) The distance between the image and the mirror is the same as the distance between the object and the mirror 3) In the image, left is right and right becomes left 4) Angle of incidence = Angle of reflection
22 Plane mirrors reflect light regularly giving a clear image which is the same size as the object - but what is different about the image? This is called lateral inversion. What would happen to the image if the surface of the image was uneven?
23 How could Jack use mirrors to help him see over the crowd to Beyonce?
24 Use a periscope
25 Copy and complete the diagram to show how the fox can see the rabbit Remember the rules!!! 1) Light travels in straight lines 2) Use a ruler and pencil 3) Reflect from the surface of the mirror 4) Angle of reflection = angle of incidence 5) Add arrows to show light ray 6) The ray must start at the object and enter the eye TICK
26 How are images reflected in non-planar mirrors? Concave Convex Homework: Research how concave and convex mirrors work and some uses of both.
27 Plenary: In pairs or threes, think of uses of periscopes and come up with a TV advert promoting them. Be creative!
28 Key words angle of incidence - The angle between the normal and the ray of light hitting a mirror. angle of reflection - The angle between the normal and the ray of light hitting a mirror. Image - A picture which forms in a mirror, or on a screen, or is made by lenses. incident ray - Light ray hitting a mirror. plane mirror - Smooth, flat mirror Normal - An imaginary line at right angles to a mirror, where a ray of light hits the mirror. ray diagram - A diagram showing the passage of light rays
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