A magnet is material that produces a magnetic field. Because of this field, magnets can both attract and repel each other (depending on which end of the magnet you use) and can attract ferromagnetic materials, such as iron. The small pieces of iron filing on the magnet in the picture follow the shape of the magnet's magnetic field.
Magnets are most often seen stuck to refrigerators.
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A mirage happens when there are areas of air close to each other at different temperatures, which causes light to bend. This often happens when there is a layer of very hot air just above a road. The result is that something that should be seen in one place is seen in another place. Mirages can look a lot like water on the ground, reflecting the sky.
Something reflects light if it is shiny enough that the light hits it and bounces back off it. The man in the picture has sunglasses that reflect light.
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When you stand in front of a light like the sun, some of the light hits you and some of the light goes past you. Where you are in the way between the sun and the ground, there will be a shadow. A shadow is just somewhere there is less light than there is around it. Shadows are the same shape as whatever is blocking the light.
Shadows change size and shape depending on how high or low the light is. Shadows are darker and clearer when the light is strong and coming from only one direction. You can make shadow puppets with your hands or some cut-out shapes, a light and a wall.
