Science - Light

Light is a form of energy

They make their own light, for example, the sun

They reflect light, for example, the moon

Light travels in striaght lines

Light travels faster than sound

This is light bouncing back off a surface

This happens when light bounces off a rough surface in all directions

This happens when light bounces in one direction off a smooth surface

A periscope has two mirrors at opposite ends of a tube

It is used to see over things

To see over a high wall or crowds

Used in submarines

This is a dark area behind something where the light cannot reach

This is a solid, liquid or gas which allows waves to travel through it

This is the splitting of light into the seven colours of the spectrum using a glass prism

Red

Orange

Yellow

Green

Blue

Indigo

Violet

Ring Out Your Great Bells In Victory

Red

Green

Blue

Yellow

Cyan

Magenta

Refraction is the bending of light as it passes from one surface to another eg. from air to glass

To reflect or bend light

Convex lens is for long sighted people.  It focuses the light so that the image is formed back onto the retina

Concave lens is for short sighted people.  It focuses the light so that the image is formed further forward onto the retina

Iris

Pupil

Cornea

Lens

Retina

Optic Nerve

To control the amount of light entering the eye

To allow light enter the eye

To make a sharp picture on the retina

It focuses light onto the retina

To change the picture into nerve messages

To carry messages from the eye to the brain

To change the shape of the lens and allow us to see things either close up or far away

To allow light into the eye and bend the light rays

These are nerve cells located on the retina that allow us to see colours

These are cells that are found in our eye that allow us to see in black and white