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Summary:
The article presents a part of the theory of vision with the use of secondary school microphysics. A simple model explains why a human eye can perceive the electromagnetic radiation of the wave length from 380 nm to 780 nm. The presented material can be used in the teaching of physics to motivate students who are interested in biology. Furthermore, it can help to integrate physics, biology and chemistry in a physics seminar for older secondary school students.
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