In Young's double slit experiment, green...

In Young's double slit experiment, green light `(lambda=5461Å)` is used and 60 fringes were seen in the field view. Now sodium light is used `(lambda=5890Å)` , then number of fringes observed are

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The correct Answer is:

We have
`n_(1)lambda_(1)=n_(2)lambda_(2)`
Number of fringes, `n_(2)=(n_(1)lambda_(1))/lambda_(2)=(60xx5461xx10^(-9))/(5890xx10^(-9))=55" fringes"`

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