Why do rays pass straight through the center of a lens?

In this video, we explore why, when doing ray tracing, we take rays to pass straight through the center of a lens. We zoom in on what exactly happens inside a lens, and figure out what approximations need to be made, and when they break down.

To support the creation of videos like these, get early access, access to a community, behind-the scenes and more, join me on patreon:

This is part of my series on introductory electromagnetism, where we explore one of the fundamental forces of nature - how your phone charges and communicates with the rest of the world, why you should be afraid of the sun, and the fundamentals of electric and magnetic forces and fields, voltages,