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Dispersion of light
 

Dispersion of light

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    Dispersion of light Dispersion of light Presentation Transcript

    • Dispersion of Light Projectee - Nishtha Pathak Class - 10 th ‘B’
    • What is Dispersion?
      • The splitting up of white light into its seven constituent
      • colours on passing through a transparent medium (like
      • glass prism) is called dispersion of light.
    • Cause of Dispersion
      • The dispersion of white light occurs because colours of
      • white light travel at different speeds through the glass
      • prism. The amount of refraction depends on the speed
      • of coloured light in glass. Now, since the different
      • colours travel at different speeds, they are refracted by
      • different angles on passing through the glass prism.
      • So, when white light consisting of seven colours falls
      • on a glass prism, each colour in it is refracted by a
      • different angle, with a the result that seven colours
      • spread out to form a spectrum.
    • Spectrum
      • The band of seven colours formed on a white screen,
      • when a beam of white light is passed through a glass
      • prism, is called spectrum of white light. The seven
      • colours of the spectrum are: Violet, Indigo, Blue,
      • Green, Yellow, Orange, and Red. It can be denoted by
      • the word VIBGYOR.
    • Newton’s Experiment
      • Newton performed an experiment to show that white
      • light consist of colours. A white light ray is passed
      • through a prism to split it into the colours of the
      • spectrum. The different coloured light is allowed to
      • pass through an identical prism kept in inverted
      • position. The light emerging out of second prism was
      • found to be white indicating that the light ray consist of
      • colours.
    •  
    • Rainbow
      • A rainbow is a natural spectrum appearing in the sky
      • after a rain shower. It is caused by dispersion of
      • sunlight by tiny water droplets present in the
      • atmosphere. A rainbow is always formed in a direction
      • opposite to that of the Sun. The water droplets acts
      • like a small prism. They refract and disperse the
      • incident sunlight, then reflect it internally, and finally
      • refract it again when it comes out of the raindrop. Due
      • to the dispersion of light and internal reflection,
      • different colours reach the observer’s eye.
    •  
    •  
    • Lets Find Out More Facts
    • What is the range of visible light?
      • Range of visible light – 0.4 microns to 0.7 microns.
      • Visible light has a large number of radiations having wavelengths ranging from 0.4 microns to 0.7 microns. That is, red light has a large wavelength compared to violet light.
    • Which component deviates maximum?
      • The violet colour has the minimum speed in prism, so the violet colour is deviated the maximum.
    •  
    • Which component deviates minimum?
      • The red colour has the maximum speed in prism, so the red colour is deviated the minimum.
    •  
    • Rate of photosynthesis?
      • Wavelength of the component that increases the rate of photosynthesis - 0.7 microns.
      • The rate of photosynthesis is the most in the presence of red light.
    •  
    • Which colour doesn’t affect the rate of photosynthesis?
      • Component which does not affect the rate of photosynthesis - green light.
      • The rate of photosynthesis is zero in the presence of green light.
    •  
    • What is the nature of the spectrum emerging out of the first prism?
      • Nature of the spectrum emerging out of the first prism - a band or spectrum of seven colours is obtained.
      • The prism splits white light into seven colours.
    •  
    • What is the nature of the spectrum emerging out of the second prism?
      • Nature of the spectrum emerging out of the second prism – white light is obtained.
      • The seven colours of the visible spectrum combine to form white light.
    •  
    •