01 May OBJECTIVESIn this experiment, you will
OBJECTIVES
In this experiment, you will
? Compare and contrast features of the patterns produced on a screen when light from a
laser passes through either one or two slits.
? Discern which features of the pattern arise from the interaction of the light with the single
slit and which arise from the double slits.
? Use the principle of superposition to explain how waves from two sources could interfere
constructively or destructively.
? Use a diagrammatic explanation of how path length differences for light passing through
the two slits give rise to bright and dark fringes in the pattern.
? From experimental parameters, predict the spacing between bright (or dark) fringes in the
pattern.
? Collect intensity vs. position data to test your predictions.
MATERIALS
Vernier data-collection interface Vernier Optics Expansion Kit
Logger Pro or LabQuest App Vernier Dynamics Track
Diffraction Apparatus Green Diffraction Laser (optional)
ruler
PRE-LAB INVESTIGATION
Direct exposure on the eye by a beam of laser light should always be avoided with any laser, no
matter how low the power.
1. Attach the laser at one end of the track so that it faces down the length of the track. Connect
the power supply. Leave the laser off until all parts are in place to avoid accidental
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