reflectance spectroscopy lab. different colors correspond to different wavelengths of visible light...
TRANSCRIPT
![Page 1: 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](https://reader033.vdocuments.mx/reader033/viewer/2022061509/56649dc75503460f94abcacf/html5/thumbnails/1.jpg)
Reflectance Spectroscopy Lab
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Different colors correspond to different wavelengths of visible light
665 nm
630 nm
600 nm
550 nm
470 nm
425 nm
400 nm
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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?
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Incoming white light
(all colors)
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White paper
Incoming white light
(all colors)
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White paper
White paper reflects all
wavelengths
Incoming white light
(all colors)
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Black Paper
Incoming white light
(all colors)
Absorbs all wavelengths
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Green PaperReflects green
light
Incoming white light
(all colors)
Absorbs other colors
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Objects appear to be different colors because of the light they reflect
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Reflected light versus emitted light
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Reflected light versus emitted light
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Reflected light versus emitted lightToday’s Lab
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Spectrum: a plot that shows how reflected light from an object varies with wavelength
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Spectrum: a plot that shows how reflected light from an object varies with wavelength
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Different objects have unique spectra
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Reflectance Spectrometer
Shines a single wavelength of light on an object and measures intensity of reflected light
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Reflectance Spectrometer
Has 2 infrared channels
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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