Optics Tutorial - 2 - Lens and focusing basics

Introduction to focusing light:
 1) Spherical surface refraction
 2) Anatomy of a lens (and a mirror)
 3) Focal length
 4) Sign of the focal length
 5) Computing a "thin lens" focal length
 6) Lens bending (introduction for later describing aberration balancing)

Homework can be found at:
http://www.opticsrealm.com/tutorials-...

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