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Reflectance Spectroscopy Lab

Reflectance Spectroscopy Lab. Different colors correspond to different wavelengths of visible light. 665 nm. 630 nm. 600 nm. 550 nm. 470 nm. 425 nm. 400 nm. Today’s Lab. If we shine light on an object, some light is absorbed and some is reflected

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Reflectance Spectroscopy Lab

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  1. Reflectance Spectroscopy Lab

  2. Different colors correspond to different wavelengths of visible light 665 nm 630 nm 600 nm 550 nm 470 nm 425 nm 400 nm

  3. Today’s Lab • If we shine light on an object, some light is absorbed and some is reflected • Which wavelengths/colors are absorbed versus reflected?

  4. Incoming white light (all colors)

  5. Incoming white light (all colors) White paper

  6. Incoming white light (all colors) White paper reflects all wavelengths White paper

  7. Incoming white light (all colors) Black Paper Absorbs all wavelengths

  8. Green Paper Incoming white light (all colors) Reflects green light Absorbs other colors

  9. Objects appear to be different colors because of the light they reflect

  10. Reflected light versus emitted light

  11. Reflected light versus emitted light

  12. Reflected light versus emitted light Today’s Lab

  13. Spectrum: a plot that shows how reflected light from an object varies with wavelength

  14. Spectrum: a plot that shows how reflected light from an object varies with wavelength

  15. Different objects have unique spectra

  16. Reflectance Spectrometer Shines a single wavelength of light on an object and measures intensity of reflected light

  17. Reflectance Spectrometer Has 2 infrared channels

  18. Infrared light has longer wavelength than red light Can think of infrared energy as the heat an object emits • Humans emit infrared energy • Planets emit infrared energy

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