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Problem
Problem
Two wavelengths of light
λ
1
\lambda_1
λ
1
and
λ
2
\lambda_2
λ
2
are sent through Young's double-slit apparatus simultaneously. If the third-order bright fringe coincides with the fourth-order bright fringe, then (1)
λ
1
λ
2
=
4
3
\frac{\lambda_1}{\lambda_2} = \frac{4}{3}
λ
2
λ
1
=
3
4
(2)
λ
1
λ
2
=
3
4
\frac{\lambda_1}{\lambda_2} = \frac{3}{4}
λ
2
λ
1
=
4
3
(3)
λ
1
λ
2
=
5
4
\frac{\lambda_1}{\lambda_2} = \frac{5}{4}
λ
2
λ
1
=
4
5
(4)
λ
1
λ
2
=
4
5
\frac{\lambda_1}{\lambda_2} = \frac{4}{5}
λ
2
λ
1
=
5
4
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