The Sun is a ball of burning hot gases. It gives off a very
bright light. The light travels a distance of 150 million km
(93.2 million miles) to reach the Earth. There would be no life
on Earth if we did not have sunlight.
The moon does not produce its own light. Moonlight is sunlight
that has bounced off the moon!
When light hits a surface, some of it bounces off or
is reflected. Mirrors are very shiny surfaces designed to reflect
nearly all the light that hits them. When you look in a flat
mirror, you see a reflection of yourself which is the same size
as you but back to front. When you look in a curved mirror
(either concave or convex) your reflection is usually a different
shape and size to you.