Re: Lena's Birthday Question: Neatest Optical Hacks

Phil Hobbs wrote:
Dave Schaack wrote:


1. The achromatic lens. Optical instruments basically wouldn't exist without it--and it's all done by kluging together the properties of glass made with and without lead oxide.

I don't quite concur. I think the kludge is that it was done with
only approximations of those properties.
.