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Chapter 9

Revise Light

Define light. Light is the visible part of the electromagnetic spectrum.
Describe the difference between luminous and non luminous objects. Luminous objects actively give off light. Non-luminous objects only reflect light.
Can you describe how light travels? Light travels as a wave and in straight lines.
Explain why shadows are formed. Shadows are caused by something opaque getting in the way of light. Light travels in straight lines and this makes shadows as it cannot bend around the object.
What is an eclipse? An eclipse is when the something passes in front of the sun and blocks out it's light. There are Lunar and Solar eclipses.
What is dispersion? Dispersion is light being scattered by either hitting an uneven surface or passing through an uneven transparent object.
What colours is white light made up of? All of them, Red, Orange, Yellow, Green, Blue, Indigo and Violet.
How is a rainbow formed? When light from the sun hit a rain drop and is refracted and separated into its individual colours. You can only see a rainbow when the Sun is behind you.
Define reflection. A reflection is the bouncing back of light, without dispersing it so that the image is reflect back at you and you can see it.
Define refraction. Refraction is the separating of light from white into its separate colours. Or the bending of light as it passes from one medium to another.
Describe how you could show refraction from air to water and from water to air. By placing a pencil into a glass of water you can see refraction from air to water. If you are under the water and look to the sky you can see refraction from water to air.
Give a use for a convex lens. To magnify an image to better see it or read.
Give a use for a concave lens. To make an image appear farther away than it is.
Created by: SC Dave