Lenses and Mirrors

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• Light waves hit a smooth surface and bounce off (reflect) at the same angle

• When light waves hit a surface and bounce off at different angles
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Law of Reflection –
Angle of incidence = angle of reflection

• Mirror – opaque material that reflects light
• Lens – transparent material that refracts light

• Convex Lens
• curves outward
• Light brought together
• magnifying glass
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Concave lens
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Curves inward
 light separated
 used in hotel peep holes

• has a reflecting surface that bulges inward (away from the incident light). Concave mirrors reflect light inward to one focal point, therefore they are used to focus light.
Unlike convex mirrors, concave mirrors show different types of image depending on the distance between the object and the mirror itself. used in headlights of vehicles to send parallel rays to infinity , in shaving mirror to get an enlarged image of the face and also by dentists to see a bigger image of the tooth / teeth

• The passenger-side mirror on a car is typically a convex mirror. In some countries, these are labeled with the safety warning "Objects in mirror are closer than they appear", to warn the driver of the convex mirror's distorting effects on distance perception.
• Convex mirrors are used in some automated teller machines as a simple and handy security feature, allowing the users to see what is happening behind them. Similar devices are sold to be attached to ordinary computer monitors .
curved mirror in which the reflective surface bulges toward the light source.
Convex mirrors reflect light outwards, therefore they are not used to focus light
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• Convex mirrors cause light to spread out, concave mirrors cause light to go in and create a focal point. But lenses work the opposite way: concave lenses spread the light out, convex lenses focus the light. WHY IS
THAT? Why don’t they work in the SAME way as mirrors, instead of the opposite way?
The reason that mirrors and lenses behave so differently is that light passes though lenses but bounces off mirrors.

• What you see when you look in a mirror.

• an image that can be projected onto a screen