Refraction in one shot
MahaToppers · YouTube
Snell's law, refractive index, total internal reflection and dispersion, all in a single revision video.
Refraction of Light
Chapter 6 of Science and Technology Part 1, SSC Std 10 (English Medium). A short revision read — free, no sign-up.
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Starting with the basics
Parth Momaya · YouTube
Lecture one: why light bends at all, and which way it bends going into a denser or rarer medium.