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.]
Held on 22 Jan 2025 · Verified 6 Jul 2026.
137.5 nm
275 nm
94.8 nm
68.7 nm
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