Viewing Single Slit Diffraction Pattern
Diffraction pattern due to single slit can be easily seen by using an electric lamp with straight filament preferably and two razor (shaving) blades.
The shaving blades are held to form a narrow slit just near the eyes. Effort is made to see the filament through the slit. Bright and dark fringes are observed with slight adjustment of the width of slit. A single blade can also show diffraction of light. A slit made in aluminium foil can also be used for the purpose. Slit made by two fingers can also be used to observe diffraction of light.