A) \[400\,\,nm\]and \[450\,\,nm\]
B) \[425\text{ }nm\] and \[400\text{ }nm\]
C) \[400\,\,nm\] and \[425\text{ }nm\]
D) \[450\,\,nm\] and \[400\,\,nm\]
Correct Answer: D
Solution :
Position 'of nth bright fringe from central maxima is \[\frac{n\lambda D}{d}\]. \[\therefore \] \[\frac{8{{\lambda }_{1}}D}{d}=\frac{9{{\lambda }_{2}}D}{d}\] \[\frac{{{\lambda }_{1}}}{{{\lambda }_{2}}}=\frac{9}{8}\] which is Correct only for option [d].
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