The sun is the main source of light and can be very dangerous. There are ways we can protect our eyes.

Any object that gives out light is luminous.

We need light in order to see things. Dark is the absence of light.

Light is reflected from surfaces.

Shadows are formed when the light from a light source is blocked by an opaque object.

The size of the shadow depends on the time of the day, shadows are longest in the early morning and late afternoon/early evening when the sun appears low in the sky.