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A transparent film of refractive index, 2.0 is coated on a glass slab of refractive index, 1.45. What is the minimum thickness of transparent film to be coated for the maximum transmission of Green light of wavelength 550 nm . [Assume that the light is incident nearly perpendicular to the glass surface.]

Options

  1. A137.5 nm
  2. B275 nm
  3. C94.8 nm
  4. D68.7 nm

Correct answer

A. 137.5 nm

Step-by-step solution

For transmitted green light to be maxima, reflected green should be minima. aligned & P =2 ₀ t = n & t = n 2 ₀ t _ = 2 ₀ = 550 2 2 =137.5 aligned

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