The difference between converging and diverging lenses. How to draw a lens diagram. The application of lenses. Identifying defects of vision and how they are corrected using lenses.

Sunlight, moonlight, torchlight... They all work the same. Let's talk about light!

Maxwell's Equations tell us a lot about electromagnetic interactions and physics.

The value of neff is necessarily angle-dependent. Inside the crystalline lens, the electromagnetic field is highly modulated and simple ray diagrams applicable in homogeneous media cannot be used.