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Teacher’s Notes

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Teacher’s Notes This sequence of slides is designed to introduce, and explain dispersion by a prism to produce a spectrum , as explained on page 206 in New GCSE Physics for You , 2006 edition. (or page 216 in GCSE Physics for You , 2001 edition). - PowerPoint PPT Presentation
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  • Teachers NotesThis sequence of slides is designed to introduce, and explain dispersion by a prism to produce a spectrum, as explained on page 206 in New GCSE Physics for You, 2006 edition. (or page 216 in GCSE Physics for You, 2001 edition).On each slide the key points are revealed step by step, at the click of your mouse (or the press of a key such as the space-bar).Before making the next mouse-click you can ask questions of the class or make statements about what is about to be revealed.This should help students to become clearer about the ideas involved.Naturally it pays to have quick practice-run first.

    To start the slide-show, press function-key F5 (or right-click->Full Screen) (to return to normal view press the key).

    For more free PowerPoint presentations, visit www.physics4u.co.uk

  • Dispersion by a prismNew Physics for You, pages 206 - 207

  • How a light ray is deviated by a prism,How white light is dispersed by a prism,The colours of a white light spectrum,About the wavelengths of different colours.Learning ObjectivesYou should learn :

  • Here is a glass prism:A ray of white light arrives

  • It is (mainly) reflected or refracted ?away from or towards the normal the normalWhat happens to the ray of light?But different colours are refracted by different angles.

  • In fact, the ray is : dispersed (split up into separate colours)like this.

  • What happens now?Red is deviated most / least ?Violet is deviated most / least ?least most

  • There is a spectrum on the screen:Red Orange Yellow Green Blue Indigo Violet ROY G BIV

  • What is the real difference between red and violet light ?

  • Understand what happens when white light enters a prism,Distinguish between deviation and dispersion,Know the colours of the spectrum, in order,Understand the connection between colour and wavelength.Learning OutcomesYou should now:

  • For more details, see: New Physics for You, page 206 - 207

    For more free PowerPoints, visit the web-site at www.physics4u.co.uk

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