CBSE Class 12-science Answered
Show that interference involves only redistribution of energy
Asked by Akshya Achu | 28 Sep, 2014, 10:07: AM
Expert Answer
Interference of light is the phenomenon of re-distribution of light energy in a medium due to the superposition of light waves from two coherent sources.
Consider that two sources of light are emitting light waves of amplitude a1 and a2. If there is no interference between the light waves from the two sources, then the intensity of light at any point on the screen will be:
I = I1+ I2
We know that intensity is the square of amplitude hence we can write that:
I = a12+a22 ------------------(1)
If light from two sources interfere, then maxima and minima will be formed. The intensities of light at maxima and minima are given by :
From (1) and (2) it follows that when the interference takes place, light energy which disappears at the regions of destructive interference appears at the regions of
constructive interference so that the averege intensity of light remains the same.
Or we can say that the intensity of light is simple being redistributed .No energy is being created or destroyed in the process.
Answered by Jyothi Nair | 29 Sep, 2014, 09:04: AM
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