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RAY MODEL OF LIGHT - Coggle Diagram
RAY MODEL OF LIGHT
LIGHT:
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Object such as the sun, lamps and fire produce light. They are call luminous objects and are sources fo light. We see luminous objects and are sources of light. We see luminous objects because the light they produce enters our eyes directly.
Most objects, such as teh moon or a book, do not produce light. They are called non-luminous objects and are not sources of light.
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How does light travel?
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This can be proved by a simple experiment. Because light travels in straight lines, we only see the light form the torch when we look through the straight tube, not the bent one.
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Mirrors
Uses fo plane mirrors
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A simple periscope makes use of mirrors. It can be used in buses to enable the driver to see people the upper deck
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Uses of curved mirrors
Convex mirrors form upright images that are always smaller than the objects. They also have a large 'field of view', that is, they allow many things to be seen.
This property makes them useful as security mirrors in shops, and as mirrors at blind corners fo roads.
Uses of curved mirrors
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This property makes them useful as a dentist's mirror, and in a microscope.
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REFLECTION:
How is light Reflected?
A property of light allows us to see ourselves in the mirror. When we look into a mirror, what we see is called an image
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Types of reflection:
There are two kinds of reflections, depending on whether the surface is smooth or rough
Regular reflection: When parallel rays of light hit a smooth surface, they are reflected as parallel rays. This is called regular reflection. In regular reflection, the image is clear and distorted.
Diffuse reflection: Rough surfaces, such as frosted glass, have many different angles of incidence. Hence, light rays are reflected off the surface at different angles.
This is called diffuse reflection. In diffuse reflection, the image is distorted.
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REFRACTION:
How is light refracted?
Light changes direction when it travels from one transparent material (medium) to another of a different optical density, e.g. form air to glass and vice versa.
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