LIGHT
NO one can see anything in a completely darkned room. There has to be light before you can see. You see when light enters your eye. And so you have to know something about light to understand how the eye Works.
WHAT IS LIGHT?
Light is a kind of energy. It’ s a type of radiation. Light energy is given off by a sun, by electric light, bulbs, by candles, and other light sources. Light energy travels from one place to another.
The light travels in atraight lines. (You can see that from the picture of the sun). It’ s often useful to think of the light travelling as light rays. The rays are like tiny beans of light, travelling through the air at 300.000 km each second.
SHADOWS AND REFLEXIONS
Because light tralvels in straigh lines, shadows form.
WHAT IS SHADOW?
Is an area behind on object where no light from a light source reacines.
When the sun shines on an object like a tree, the sun’ s cannot bend round cornrs to reach the area behind it. That’ s why the area behind the tree is dark, and that’ s what makes. The shadows light rays can be bounced off, or reflected off an object you see thid board because rays of light are being reflected from it into your eye. Shiny, surfaces, like a mirrors reflects light best you can see how a mirror reflects the rays.

LIGHT AND SOUND

The light comes from the sun. it is quite high up in the sky because the shadows are long ( vertical plane).
other sources of light are: the lamps, candies, torches, screen,and so on.
natural sources of light:the sun amd the moon.the shape and the size of the shadow depends on the shape of the object that is causing the shadow and its orientation with respectto the source of light.
SOUND: Intense sounds can be heard from a greater distance from the place of origin than weaker sounds. for example: the sound made by a computer can heard when we are working on the computer but not if we are 40 or 50 meters away the pitch is defferent also much more intense sounds are made on a drum than on a guitar.

red car goes black

You will need:- 1 Strong Torch and rubber band.- Green Cellophane- 1 Red object e.g. car, tomato, hat- A very dark room Instructions1. Place the green cellophane over the torch and secure with a rubber band.2. Darken the room and shine the green light on the red object4. What colour do you see? Try different coloured objects and lights. Is the effect always the same?