Refraction, diffraction and interference (AQA A-Level Physics): Flashcards

How much a material slows down light

$n = \frac{c}{c_s}$

Approx. 1

$n_1 \sin \theta_1 = n_2 \sin \theta_2$

Entering more optically dense medium

$\sin \theta_c = \frac{n_2}{n_1}$ where $n_1 > n_2$

Angle of incidence > critical angle

Core has higher refractive index

Use narrower cores

Use monochromatic light