Show that interference involves only redistribution of energy
Asked by Akshya Achu | 28th Sep, 2014, 10:07: AM
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 | 29th Sep, 2014, 09:04: AM
- coherent sources
- two coherent lights with of intensity 5 into 10 to power per to permit your each superimpose and produce the interference pattern on a screen at a point where the path difference between the wave is Lambda divided by 6 where Lambda is the wavelength of the wave find the first phase difference between wave second resultant intensity at the point
- We for equal wave intensities the intensity at a point is given by but where does the formula come from??
- Question 15
- kindly answer
- kindly provide answer pl
- In young double slit experiment, slit with ratio is 3:2 then find out the ratio of the maximum and minimum intensity of interference of light.
- How is phase difference related to path difference?
- In Young's double slit experiment, the distance between the slit is kept smaller than the wavelength of the light. What is the effect?
- Why is Interference pattern not detected when the two coherent sources are far apart?
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