Let's take another look at light in this KS3 Science quiz. Light travels in straight lines but we can change its direction of travel quite easily using mirrors and lenses. A lens is made from a piece of transparent material, often glass, and it has curved surfaces. When light enters a transparent material at a right angle, it continues on its journey in exactly the same direction. If light enters the transparent material at an angle, it is refracted (bent). The first good lenses were made by a Dutch cloth merchant in the 17th century so that he could check the quality of cloth more carefully. He used two of his lenses to invent the world's first telescope.
Colour is an amazing thing. Daylight contains all of the colours of the rainbow - we say it is white light. If you look at a red object in daylight, it looks red, a blue object looks blue. The reason for this is that the red object reflects only red light and the blue object only reflects blue light. Now, if you look at a red object in red light, it still looks red but the blue object would look black - there is no blue light for it to reflect. Black is the absence of all colours, something that is black is therefore absorbing all of the light that falls on it.
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You can find more about this topic by visiting BBC Bitesize - Light Waves
In a lunar eclipse the Earth is between the Sun and the Moon
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Some of it is reflected but most of it passes into the glass because glass is transparent
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A little of the light is reflected, but if the light enters the water at exactly a right angle, it will continue on in the same direction as it was travelling in air
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The normal is a line drawn on a ray diagram to help to work out what will happen to a ray of light
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It contains all of the colours of the rainbow
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Red light has the longest wavelength and lowest frequency
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Isaac Newton was the first person to investigate this
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They are different from the primary colours of art
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In 1867 John Tyndall discovered why the sky is blue. Particles in the air scatter blue light more than red
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It absorbs all of the other colours of light
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