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The laws of reflection.

Published byNelson McCarthy Modified over 5 years ago

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Presentation on theme: "The laws of reflection."— Presentation transcript:

1 The laws of reflection

2 Plane (flat) mirror Reflection

3 Lots of spectacular and beautiful effects are caused by the reflection of light.
Reflections occur when light bounces off the surface of water or some other smooth surface into your eyes.

4

5

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7 The laws of reflection A ray of light striking a mirror is reflected as shown in the diagram

8 The laws of reflection Term Definition Angle of incidence
The angle between the ray of light that hits the mirror and the normal. Angle of reflection The angle between the ray of light that is reflected off the mirror and the normal. Incident ray The ray shinning onto the mirror. Reflected ray The ray that bounces off the mirror. Normal A line that is drawn at right angle(90°) to the mirror.

9 The angle of incidence is equal to the angle of reflection.
If the angle of incidence and the angle of reflection are measured using a protractor then we will always find that: ANGLE OF INCIDENCE = ANGLE OF REFLECTION The angle of incidence is equal to the angle of reflection.

10 Describe light reflection from plane mirror.
From the last lesson You should be able to... Describe light reflection from plane mirror. Describe images in plane mirrors.

11 Describe images in curved mirrors.
From today’s lesson You should be able to... Describe images in curved mirrors.

12 This is a concave mirror.
Concave means curved inwards like a cave.

13 Light reflection of curved mirror
Principal axis Curved mirror

14 Light reflection of curved mirror
Two parallel light rays hit a concave mirror

15 Light reflection of curved mirror
These light rays reflect off the mirror

16 Light reflection of curved mirror
These light rays reflect off the mirror

17 Light reflection of curved mirror
These reflect off the mirror and meet at a point called focus.

18 Light reflection of curved mirror
These reflect off the mirror and meet at a point called focus.

19 Light reflection of curved mirror
Focal length is the distance of the focus from the mirror’s reflecting surface.

20 Light reflection of curved mirror
Reflected ray Incident ray

21 Light reflection of curved mirror
Incident ray Reflected ray

22 What would happen if we place the light source at the focus of a concave mirror?

23 When a light source is placed at the focus of a concave mirror.
Light at focus

24

25 Parallel light rays

26 This is why concave mirrors are used as reflectors in torches, car headlights and floodlights.

27

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