In Young's double slit experiment, the 7th maximum with wavelength $\lambda$₁ is at a distance d₁ and that for wavelength $\lambda$₂ is at a distance $d_2$ Then d₁/ $d_2$ is 

• A

  ${\mathrm{\lambda }}_1/{\mathrm{\lambda }}_2$

• B

  ${\lambda }_2/{\lambda }_1$

• C

  ${\mathrm{\lambda }}_1^2/{\mathrm{\lambda }}_2^2$

• D

  ${\mathrm{\lambda }}_2^2/{\mathrm{\lambda }}_1^2$