In Young's double slit experiment using ...

In Young's double slit experiment using sodium light (`lamda=5898Å`) 92 fringes are seen if given colour `(lamda=5461Å)` is used how many fringes will be seen

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The correct Answer is:

Since the same field of view is used.
`n_(1)lamda_(1)=n_(2)lamda_(2)" "therefore n_(2)=(92xx5898)/(5461)=99`

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