RE: pinhole Young's Experiment

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From: Nasif Iskander (nasif.iskander@sfuhs.org)
Date: Mon Sep 02 2002 - 17:49:01 PDT 

Subject: RE: pinhole Young's Experiment
Date: Mon, 2 Sep 2002 17:49:01 -0700
Message-ID: <32FC12D1E2E88C49BAC416AD237EFC62077CA8@EXCH2K.sfuhs.loc>
From: "Nasif Iskander" <nasif.iskander@sfuhs.org>

Charlie -
The desctructive interference only happens in specific directions; it is always accompanied by constructive intereference somewhere else. In Young's double-slit experiment a pattern of light and dark fringes is produced; the effect of the interference is to "concentrate" the light into the bright fringes. The "missing" energy from the dark areas is sent to the brighter areas.
 
Nasif Iskander
SF University High School

        -----Original Message-----
        From: Cbdirtball@aol.com [mailto:Cbdirtball@aol.com]
        Sent: Mon 9/2/2002 12:37 PM
        To: pinhole@exploratorium.edu
        Cc:
        Subject: pinhole Young's Experiment
        
        

        The other day a student asked a good question that puzzled me:
        
        When light (as in Young's double-slit experiment) interferes destructively,
        where has the energy gone that existed in the two waves that interfered?
        When a demonstration of interference is conducted with a spring and filmed,
        it is clear that that while the two waves with opposite displacement cancel
        each other for a brief moment, energy is present in the spring at the nodal
        point.
        
        Is there corresponding stored energy when light interferes destructively?
        
        Charlie Bissell
        Hillsdale High School
        
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