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Unveiling Light's Dual Nature: Particle and Wave Models

Explore the mystery of light through Newton's particle model and wave theory. Witness diffraction, interference, and the photoelectric effect in action. Discover the colorful world of thin films and polarized light.

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Unveiling Light's Dual Nature: Particle and Wave Models

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  1. Newton’s Particle Model Wave Model 45o #1 air light speeds up light slows down 32o #2 water #2 water

  2. Light is an electromagnetic wave. The diagram shows a linear polarized wave

  3. Waves exhibit diffraction and interference effects

  4. Mystery of light: dual nature particle / wave

  5. Diffraction rectangular grid razor blade circular aperture

  6. red light does did result in the emission of electrons from the surface of sodium metal surface Particle nature of light: photoelectric effect

  7. Zn photoelectrons ejected Mg no photoelectrons ejected Li Cs infrared ultra- violet visible

  8. ultra-violet light causes electrons to be ejected from the electroscope the leaves become negatively charge and hence repel each

  9. without coating The colour is due to a thin film covering. The colours are due to a thin layer of oil of varying thickness on water. with coating Thin films are used to reduce reflections on glass. soap bubbles

  10. incident light  = 420 nm air: refractive index 1 oil: refractive index 1.40 oil: thickness 225 nm glass refractive index 1.54

  11. incident wave reflected wave:  rad change in phase on reflection since n1 < n2 1: air reflected wave:  rad change in phase on reflection since n2 < n3 2: oil 3: glass The two reflected waves interfere with each other: in phase  constructive interference out of phase  destructive interference

  12. light reflected off water is polarised

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