A light ray is traveling in air with an index of refraction of unity and it is reflected at the boundary or a second medium with an index of refraction n. Consider the optical coating on a glass lens where the index of refraction of the coating is n, where n is greater than the index of refraction of the air. Assume: The index of refraction of the lens is greater than that of the coating. To minimize the reflection of a ray with a wavelength 500nm and incident angle θ=0, what is the minimum nonzero thickness of the coating?

Question

Frankie Abbott

Physics

29 December, 11:38

A light ray is traveling in air with an index of refraction of unity and it is reflected at the boundary or a second medium with an index of refraction n. Consider the optical coating on a glass lens where the index of refraction of the coating is n, where n is greater than the index of refraction of the air. Assume: The index of refraction of the lens is greater than that of the coating. To minimize the reflection of a ray with a wavelength 500nm and incident angle θ=0, what is the minimum nonzero thickness of the coating?

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Daphne · Answer 1

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Explanation:

Thickness coating = t

wavelength of light λ = 500 nm

2 t = (m+0.5) λ

Here m = 0

t = λ/4

= 500/4 nm

= 125 nm

= 125*10^ (-9) m