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Refraction

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Presentation Transcript

  1. Refraction • Bending of light when it passes from one medium to another • Refraction occurs because the speed of light depends on the material through which it passes • Index of refraction = ratio of the speed of light in vacuum to its speed in the material

  2. Refraction of a meter stick upon entering water. • Snell's law: n1 sin q1 = n2 sin q2 n = refractive index q = normal angle Wavefronts in Air... Water

  3. Refraction in a piece of glass • If two surfaces of the glass are parallel, the emerging wave is parallel to incident wave • Otherwise the emerging wave and incident wave have different directions

  4. Dispersion • Dispersion occurs because the index of refraction depends on wavelength • Violet light is bent most • Red light is bent least

  5. The Pink Floyd Diagram

  6. Making an image with a TELESCOPE Aperture Aperture Image

  7. Making spectra with a SPECTROSCOPE Aperture Aperture Image Dispersion

  8. Making an image with a TELESCOPE SLIT SLIT Image

  9. Making spectra with a SPECTROSCOPE SLIT SLIT Image Dispersion

  10. Spectral resolution: SLIT SLIT Image Dispersion

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