Light is a type of energy that allows us to see things. Light travels as rays, in straight lines. Light rays are given off by things that glow, such as the Sun, a candle, or a light bulb. These things are called light sources. Other objects around us look bright because they bounce light from light sources back to our eyes. When there is no light source everything looks dark, for example at night.
Seeing things
Most things do not give out their own light. We can see these objects when we look at them because they reflect the light that falls on them. Light from a light source, such as the Sun, bounces off the object and into our eyes.
Creating shadows
If something solid gets in the way of light coming from a source, the light rays are blocked. This creates a shadow behind the object, which is the same shape as the object.
Shadow length
The length of the shadow of an object can change, depending on where the light source is. The more directly above an object a light source is, the shorter the object’s shadow will be.
Midday
At midday, the Sun is almost directly overhead. The light rays from the Sun can reach most of the ground on the far side of the ball, forming a short shadow.
Late afternoon
By late afternoon, the Sun is low in the sky. The light rays from the Sun are blocked from reaching a large area of ground on the far side of the ball, so a long shadow forms.
Picture Credit : Google
