Light What is light Light is a form

Light

What is light? • Light is a form of energy • It can be converted to other forms of energy • An example of this is the Crookes Radiometer

• A luminous object gives off its own light • Non-luminous objects do not give off their own light

Luminous

Non-luminous

Light Travels In Straight Lines • Light always travels in straight lines • Light from a lightbulb will travel out in all directions, but each ray of light travels in a straight line

Shadows • Shadows are formed when an object blocks light • Shadows are not always sharp • This is because the light is not always completely blocked

Solar eclipse

Reflection • Reflection is when light reflects back from a surface

Periscopes

Refraction • Refraction is the bending of light as it passes from one medium to another • A medium is something light travels through • Light bends because the new medium has a different density

Lenses • Lenses are used to bend rays of light • A convex lens brings rays of light together

• Concave lenses makes rays of light spread out

Dispersion • Dispersion is the breaking up of white light into seven colours

• Crookes radiometer • Light travels in straight lines • How shadows are formed • Reflection from a mirror • Periscope • Refraction in a glass block • Refraction in water • Refraction from an object in water • Convex lens • Concave lens • Dispersion of light