Statement I: The maximum intensity in interference pattern is double the intensity due to each slit.
Statement II: Intensity is directly proportional to square of amplitude.
In the light of the above statements, choose the most appropriate answer from the options given below.
Text Solution
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Statement I is incorrect but Statement II is correct.
Let the amplitude of waves from each slit be 
, therefore intensity due to each slit 
.
If interference is destructive, the resultant amplitude 
Minimum intensity 
In case when interference is constructive, the resultant amplitude 
Maximum intensity 
which is four times the intensity due to each slit.
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