Show:
Light Sources
Light Travel
Colours
Light Technology
This & That
100

What is artificial light?

Light that is man-made; power comes from an outside resource.

100
Give an example of refraction.
Rainbows - when light passes through water droplets.
100
What are the 3 primary colours?
red, blue, green
100
Who was Thomas Edison and how did he change our world?
He invented the electrical light bulb and started a company that helped everyone use electricity for homes, theatres, and streets.
100
Give 3 examples of objects that are good at reflecting light.
CD, mirror, aluminum foil
200

Give 3 examples of artificial light.

lamp, flashlight, car headlights

200
Give an example of reflection.
Shining a light onto a CD
200
Which colour of the rainbow bends the least?
red
200
Describe the light invention of a microscope and how it works.
Microscopes use light and lenses to make an object appear much larger than it actually is.
200
Give 3 examples of objects that do not reflect light well.
black paper, a dark sock, a black ball
300
What is natural light?
light that comes from nature or natural sources
300
What is reflection?
When light bounces off of an object
300
Name the colours of the rainbow in order from the colour that bends the least to greatest.
ROYGBIV - red, orange, yellow, green, blue, indigo, violet
300
Describe optical fibres and how they work.
They are hair-thin tubes that allow the exact same amount of light to enter and leave the tube and are used for TVs, computers and in hospitals for surgery.
300
What does translucent mean? Give an example.
An object or material that lets some light pass through - stained-glass window
400
Give 3 examples of natural light
sun, moon, fireflies
400
This happens when light bends as it passes through certain materials.
Refraction
400
Which colours make up white light?
red, blue and green
400
Describe lasers and how they work.
A laser is a machine that turns light into a narrow beam of very bright light. Lasers are powerful and can cut through skin and steel and can be used to carefully measure distances through reflection.
400
What does transparent mean? Give an example.
Material that lets all light pass through – clear glass window
500
True or false. The Aurora Borealis (Northern Lights) are a form of artificial light.
false
500
Explain how light travels.
Light travels in a straight line and cannot bend around corners.
500
How is a rainbow formed?
When light passes through forms of water (rain, mist, dew) or by shining a light onto a prism or a CD in water.
500
Describe any other light technology that you learned through our presentations in class.
Camera – A lightproof box with a hole in the front with a shutter to stop light from getting inside. When a photograph is taken the shutter opens to let light reach the film which is coated with chemicals and are sensitive to light. The lens focuses the light to form an upside down image on the film. Telescope - A telescope collects light from a distant object and makes those objects appear to be closer than they actually are. The telescope uses refraction with lenses that bend the light to form an image. Television - The TV captures moving pictures and the light from the scene is changed into electrical signals. Radio waves carry the picture signal over the air to the TV and the Cathode-ray tube creates all the colours on the TV using the 3 primary colours
500
What is opaque? Give an example.
Material that does not let any light pass through - metal