  The complementary wave and particle character of quantum objects (or
quantons) was pointed out by Niels Bohr. This wave-particle duality, in the
context of the two-slit experiment, is now described not just as two extreme
cases of wave and particle characteristics, but in terms of quantitative
measures of these natures. These measures of wave and particle aspects are
known to follow a duality relation. A very simple and intuitive derivation of a
closely related duality relation is presented, which should be understandable
to the introductory student.
