A) 1 : 2
B) 2 : 1
C) 4 : 1
D) 1 : 1
Correct Answer: B
Solution :
Resultant intensity \[I={{I}_{1}}+{{I}_{2}}+2\sqrt{{{I}_{1}}{{I}_{2}}}\cos \varphi \] At central position with coherent source (and \[{{I}_{1}}={{I}_{2}}={{I}_{0}}\] \[{{I}_{con}}=4{{I}_{0}}\] ... (i) In case of incoherent at a given point, f varies randomly with time so (cos f)av = 0 \ \[{{I}_{In\,coh}}={{I}_{1}}+{{I}_{2}}=2{{I}_{0}}\] ... (ii) Hence \[\frac{{{I}_{coh}}}{{{I}_{Incoh}}}=\frac{2}{1}\].You need to login to perform this action.
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