The present paper describes a laboratory course held at the ICFA’99 Instrumentation School in Istanbul, Turkey. This course intends to introduce position sensitive multianode photomultiplier tubes (Hamamatsu R5900 type M16 and L16). Using a light emitting diode, the student will measure position sensitivity by scanning the light spot across the M16 PMT. The second part of the exercise consists of measuring a diffraction pattern produced by light passing through a slit. For this purpose the L16 PMT is used and the students attention is drawn to the pedagogical problem of wave-particle duality. ©2000 American Institute of Physics.