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Great Lakes Teacher Resources
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Students are able to use a secchi disk to measure the turbidity of water by determining the depth at which the sechi disk is no longer visible and using the data in a formula to quantify the results. They are able to use Vernier probes to condcut water quality testing for: dissolved oxygen, nitrates, pH, temperature, phosphorous and produce computer printouts of the data collected.
Learners examine a fresnel lens and compare it to simple concave and convex lenses. They measure its focal length and then discuss why this type of lens is useful in a lighthouse system. That is about all there is to this lesson. It can certainly enrich a social studies lesson on how lighthouses spurred the growth of the shipping industry, or it can be an addition to your physical science lesson on lenses and light.