Ratio of distances of bright fringes of given orders for two wavelengths

1. A.
   $\frac{3\lambda_1}{\lambda_2}$
2. B.
   $\frac{3\lambda_2}{\lambda_1}$
3. C.
   $\frac{\lambda_1}{3\lambda_2}$
4. D.
   $\frac{\lambda_2}{3\lambda_1}$

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1. A.
   $\frac{\lambda_1}{\lambda_2}$
2. B.
   $\frac{\lambda_2}{\lambda_1}$
3. C.
   $\frac{\lambda_1^2}{\lambda_2^2}$
4. D.
   $\frac{\lambda_2^2}{\lambda_1^2}$

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1. A.
   $\dfrac{3\lambda_1}{4\lambda_2}$
2. B.
   $\dfrac{3\lambda_2}{4\lambda_1}$
3. C.
   $\dfrac{4\lambda_1}{3\lambda_2}$
4. D.
   $\dfrac{4\lambda_2}{3\lambda_1}$

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