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

Physics

Flower

28 February, 15:54

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?

+4

Answers (1)

Know the Answer?

Bradyn Oliver · Answer 1

Explained

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