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:

`lamda_(1)=5898A^(@),n_(1)=92,lamda_(2)=5461A^(@),n_(2)=?`
For same path diff
`n_(1)lamda_(1)=n_(2)lamda_(2)`
`n_(2)=(n_(1)lamda_(1))/(lamda_(2))`
`=(5898xx90)/(5461)=99`

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