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# Difraction

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### Difraction

1. 1. DIFFRACTION NURUL FADHILAH ALIAS MRSM KUALA KLAWANG
2. 2. Solar glory at the steam from hot springs. A glory is an optical phenomenon produced by light backscattered (a combination of diffraction, reflection an d refraction) towards its source by a cloud of uniformly sized water droplets.
3. 3. Waves tend to curve round the edges of the barriers.
4. 4. DIFFRACTION… DEF. :  the spreading out of waves when they move through a gap or around an obstacle. CHARACTERISTICS:  the direction of propagation and shape of the waves change  Wavelength?  Frequency? and  Speed? remains the same!!!
5. 5. DIFFRACTION OF WATER WAVES SMALL SLIT • The waves are more circular and originates from the small slit • The effect of diffraction is obvious LARGE SLIT • The waves are bent only at the edges • The effect of diffraction is not so obvious
6. 6. If the gap is bigger than the wavelength, i ) the waves in the centre go through the gap unchanged ii) the waves at the edges are diffracted
7. 7. Small vs. Large OBSTACLE SMALL LARGE • Effect of diffraction is obvious • Effect of diffraction is not so obvious
8. 8. If the barrier is bigger that the wavelength, a large shadow area is formed behind the barrier. the diffraction pattern of the waves is less obvious. The pattern of light diffraction is not easily seen because it wavelength is small ( x 10 -7 m). AMPLITUDE of waves AFTER diffraction is SMALLER! WHY?
9. 9. DIFFRACTION OF LIGHT WAVES Diffraction pattern of a PIN HOLE EXP. Bright and dark fringes Diffraction pattern of a SINGLE SLIT PLATE Bright and dark fringes The light spread after spreading the pin hole The light spread after passing the slit
10. 10. Diffraction In Light Waves Will Occur When 1. Width of the slit or pin hole • Must be COMPARABLE to that of wavelength of the light waves. 2. Light Source • The light source must be MONOCHROMATIC • i.e. one wavelength only!
11. 11. Experiment 1 Effect of the size of slit on diffraction pattern Conclusion: The smaller the size of the slit, the greater the effect of diffraction.
12. 12. Experiment 2 Effect of the colour of light on diffraction pattern Conclusion: The longer the wavelength, the greater the effect of diffraction. (Red light has longer wavelength while purple light has shortest wavelength.)
13. 13. Experiment 3 Effect of the distance of the screen from the slit on diffraction pattern Conclusion: The further the screen from the slit, the further the distance between bright bands formed on the screen.
14. 14. DIFFRACTION OF SOUND WAVES • Sound waves diffract around corners • Audible sound waves have wavelengths in the range of 1.5 cm to about 15 metres… • Hence, sound waves in the range of the width of a doorway (around 1-2 metres) will diffract in the room.