What is light?
|Theophilos via photopin cc|
Light is a type of energy called “Electromagnetic” (EM) radiation. When we see light we see it in straight lines called rays.The scientific study of light is called Optics. All Electromagnetic energy (including light) actually travels in waves. Light is the only type of EM energy that we can see (this is called the visible spectrum). Other types of EM radiation include radio waves, microwaves and (Ultra Violet) UV waves.
|San Diego Shooter via photopin cc|
The colour of light
|buttersweet via photopin cc|
Did you know… the brightness of light is measured in lumens? Our eyes are usually comfortable with a brightness up to 3,500 lumens.
How is a shadow made?
|halfrain via photopin cc|
Did you know… the biggest shadow we will ever see is a solar eclipse?
How fast does light travel?The speed of light is 300,000 kilometres (or 186,000 miles) per second. Distance in space is measured in light years; it is the distance that a ray of light travels in one year – 9.46 trillion kilometres (5.8 trillion miles).
Did you know… it