Lenses, eyes and optical devices

All about lenses – A Quick Course

Convex lenses – Ray diagrams

How a telescope works

Photographic lenses

the beginning of this video explains how focal length relates to field of view. The rest… is for those who love photography. Keep exploring!

How an eye works – simplified

How an eye REALLY works

4:00 – how an eye focuses on distant objects

Correcting astigmatism

Vision correction explained

The workings of a magnifying glass demystified

Microscope: The Tube That Changed the World

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