Refraction

Topics

• Refractive Index
• Snell’s Law

${\theta }_{\text{crit}}={\sin }^{-1}(\frac{n_b}{n_a})$

• When an light ray makes an angle ${\theta }_{\text{crit}}$ with the normal of the medium surfaces, the resulting light ray travels along the seam between the mediums rather than reflecting or refracting
• $n_a$ is the medium that the light enters from
• $n_b$ is the medium that the light enters