Light 02
Colours are caused by light having different frequencies and wavelengths.

Light 02

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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  1. Which of the following statements about light travelling from air to water is true?
    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
  2. In a solar eclipse, which of the following is true?
    In a lunar eclipse the Earth is between the Sun and the Moon
  3. Why does grass look green in daylight?
    In 1867 John Tyndall discovered why the sky is blue. Particles in the air scatter blue light more than red
  4. Light from the Sun is called:
    It contains all of the colours of the rainbow
  5. Colours are caused by light having different:
    Red light has the longest wavelength and lowest frequency
  6. Light can be split into colours of the spectrum using a prism. What is this process called?
    Isaac Newton was the first person to investigate this
  7. When light travels from air to glass it does which of the following?
    Some of it is reflected but most of it passes into the glass because glass is transparent
  8. The three primary light colours are:
    They are different from the primary colours of art
  9. A red filter will only:
    It absorbs all of the other colours of light
  10. When light travels from air to glass at any angle other than ninety degrees, which of the following is true?
    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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