In a Young's double slit experiment the spacing between the slits is $0.3 \mathrm{~mm}$ and the screen is kept at a distance of $1.5 \mathrm{~m}$. The second bright fringe is found $6 \mathrm{~mm}$ from the central fringe. The wavelength of the light used in the experiment is

• A

  $625 \mathrm{~nm}$
• Correct answer
  B

  $600 \mathrm{~nm}$
• C

  $550 \mathrm{~nm}$
• D

  $500 \mathrm{~nm}$

Hence, the correct answer is option: 'B'.