White light with uniform intensity across the visible wavelength range of 400 nm to 800 nm is incident almost perpendicularly from above onto a horizontal liquid film of refractive index 1.25 and of thickness 300 nm . The medium on both sides of the film is air. The wavelength of light reflected by the film which appears brightest to an observer seeing it from the top is close to

• A

  600 nm
• Correct answer
  B

  500 nm
• C

  300 nm
• D

  750 nm

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