Answer to Question #102521 in Optics for ZZ

Question #102521
Two coherent sources of light having intensity ratio 16:1 produce an interference fringe pattern. Calculate the ratio of the intensities of bright and dark fringes.
1
Expert's answer
2020-02-07T10:35:06-0500

Let the intensities of individual source be 16I  & I16 I\ \ \&\ I


Bright fringe (maximum) intensity,

Imax=(I1+I2)2\newline I_{max} = (\sqrt{I_1 } + \sqrt{I_2})^2


Dark fringe (minimum) intensity,

Imin=(I1​​I2​​)2I _ {min} ​ =(\sqrt I _1 ​ ​ − \sqrt I _2 ​ ​ ) ^2


ImaxImin=(I1+I2)2(I1I2)2\dfrac {I_{ max}} { I _{ min} ​} ​ =\dfrac{ ( \sqrt I _ 1 + \sqrt I _ 2 ) ^ 2} { ( \sqrt I _1 - \sqrt I _ 2 ) ^ 2 } ​

    \implies ImaxImin=(4+1)2(41)2=25:9\dfrac{I_{max}}{I_{min}}={\dfrac{(4+1)^2} {(4-1)^2}}=25:9




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