Light Energy

Front

What is light?

Back

Light is a form of energy which is detected with the eyes and enables vision.

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Fact 1 about light

Back

It is a form of energy which is detected with the eyes and enables vision.

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Fact 2 about light

Back

Light travels in waves

Most of the light you see is white or natural

Light travels fast at a speed of 300,000 kilometres per second and will go on until it hits an object that comes in it's path

Sir Isaac Newton was the 1st scientist to discover anything about light and colour

The sun is the most important source of visible light

Light always travel in a straight line from it's source. The lines are called rays

When light shines on a white object all the colours are reflected so the object looks white. Black objects absorb light of every colour and reflect none.

An object has a particular colour because it reflects one colour to the eyes and absorbs all the other colours. Ex. GREEN OBJECTS LOOK GREEN BECAUSE THEY ABSORB MOST OF THE OTHER COLOURS IN LIGHT BUT ONLY REFLECT THE GREEN LIGHT.

Front

What are the 3 things that can happen when light hits an object in its path

Back

It can be reflected, it can be transmitted and it can be absorbed

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Reflected

Back

When light hits an object and bounces off, we say it is reflected. Reflected light is what helps us to see

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Transmitted light

Back

When light goes strait through an object, it is said to be transmitted.

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Absorbed light

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If the light is not completely reflected by the object, some of it is said to be absorbed.

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Transparent materials and light

Back

If you are able to see clearly through an object, it is allowing light to pass through it. Transparent materials such as glass, clear plastics, air and water allow almost all of the light to pass through them without being absorbed.

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Transluscent materials and light

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Some materials allow light to pass through them, but it is not seen through easily. Translucent materials such as waxed paper, frosted glass and sheer clothing allows some light to pass through them while some light is absorbed. The objects on the other side of translucent materials appear fuzzy and unclear.

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Opaque Materials and light

Back

Opaque does not allow light through it. Because most of the light is reflected or absorbed by the object. Opaque materials such as aluminum foil, most clothing and concrete walls absorb light.

Some opaque materials maybe dull or shiny. Shiny materials such as ceramic tiles reflect light. Dull materials such as metal, wall, wood and stone absorb light.