Abstract
A simple photometer constructed from an LED and an op amp can be used to measure light in a number of physical situations. A variety of LEDs exist to investigate different wavelength ranges. Combined with an inexpensive transit, the LED photometer can be used to carry out skylight studies and atmospheric optical depth measurements. The activities described in this paper can help students understand why the sky is blue and introduce students to the basics of radiation scattering and planetary atmospheres.
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