Lesson on Properties of Light

Properties of Light

P4 science unit 10​

By U T

We are able to see if the light enters our eyes

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​HOW DO WE SEE

OBJECTS AROUND US?​

THE SUN

BURNING CANDLES

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STARS

​EXAMPLE OF LIGHT SOURCES

THINGS THAT ​GIVE OUT LIGHTS DIRECTLY

Light from the light source​s fall from the object. Then the light reflects and enter our eyes.That show reflection is when light bounces off an object.

WHAT IS REFLECTION?​

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​The amount of Light reflected from different surface is different

​a smooth surface reflects

light in same direction​

​​a rough surface reflects

light in different direction​

we use mirror to see object we cannot look at directly. This is possible because the object reflect the light from the light sources onto the mirror

MIRROR

​A periscope allows us to see objects that we are not looking at directly. It consists of 2 mirrors to reflect light into our eyes

​​PERISCOPE

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three categories of materials

​TYPE OF MATERIALS	DESCRIPTION​	EXAMPLES​
​TRANSPARENT material allow almost all light to pass through	​​We can see clearly through them	​glass window clear plastic
TRANSLUCENT material allow some light to pass through​	​We cannot see clearly through them	​frosted glass tissue paper
​OPAQUE material do not allow any lights to pass through	​We cannot see through them at all	​wood metal

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A SHADOW IS FORMED BECAUSE THERE IS NO LIGHT ALLOWED TO PASS THROUGH THE OBJECT​

HOW ARE SHADOW FORM?

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