The minimum and maximum path difference at the detector as it is moved along the line\[{{S}_{1}}P\]are (respectively)
A) zero,\[2.2\times {{10}^{-2}}cm\]
B) zero,\[1.1\times {{10}^{-2}}cm\]
C) zero, zero
D) \[2.2\times {{10}^{-2}}cm,2.2\times {{10}^{-2}}cm\]
Correct Answer: A
Solution :
The path difference is maximum when the detector is just at the position of \[{{S}_{1}}\] and its value is equal to \[2.2\times {{10}^{-2}},\] i.e. the separation between the sources. The path difference is minimum when the detector is at a large distance from \[{{S}_{1}}.\] In this case path difference is close to zero.
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