Question

Explain Snell's Law of Refraction with equations for the refractive index when:
(i) When light travels from a medium of less density to one of more density
(ii) When light travels from a medium of more density to one of less density

Answer 1

When light travels from a medium of less density to one of more density its ray bend towards normal

When light travels from a medium of more density to one of less density its ray bend away the normal

Answer 2

Answer:

Refractive Index (Index of Refraction)

Figure 1 - Refraction of Light.

Formula 1 - Snell's Law. n 1 × sin(θ 1) = n 2 × sin(θ2)

Formula 2 - Numerical Aperture. NA (numerical aperture) = n × sin(θ)

Formula 3 - Refractive Index (or Index of Refraction) n = c/η