I recently purchased a new telephoto lens for my camera. One of the lenses is made of fluorite, and the other is made of a special low-dispersion optical glass. This means that the light passing through the lens is not broken up into its corresponding colors. While great for photography, it would not be ideal for a gemstone. Which of the following gemstones would make the worst lens? a. Lapis Lazuli
b. Quartz
c. Diamond.
d. Demantoid
e. Goshenite

I would say quartz but I’m not 100% sure.

May consider a group  g=({0,1},+)g=({0,1},+)where  ++  will work as the xor operator like we work in boolean algebra. note here, that ‘00’ and ‘11’ are not the usual 0 and 1 that we work with everyday. the elements are  called  ‘00’ and ‘11’ and  may not mean  zero (nothing) and one (single). ‘00’ is the identity for the given binary operator +, meaning that any element operated with ‘00’ gets us that element itself.  for a set  ss  in  g′g′  having more elements than just  {0,1}{0,1}  the values for  a+b∈sa+b∈s, such that  a∈s,b∈sa∈s,b∈s, have to be first defined, only then can you determine the value of  1+11+1. the answer could possibly have been  22  if oanswer is25,000

Probably north korea if your family has decided to use only nuclear power.