
Aim: to observe Diffraction Patterns using a Low
Power Laser 
See Diffraction, Diffraction Patterns, Young's
Experiment, The Diffraction Grating 

Observe and draw (or photograph) the diffraction
patterns produced by 
 single slits of different widths (note the width
of the slit) 
 double slits of different slit separation (note
the slit widths and separations) 
 multiple slits and diffraction gratings (note the
number of slits per mm) 

Use a diffraction grating to
measure the wavelength, λ of the laser light. 
For constructive interference: 

By measuring D and y, we can find the angle
θ and hence λ can be found. 