Nicol prism
achromatic lens
astigmatic lens
burning glass
camera
coated lens
concave lens
concavo-convex lens
condenser
convex lens
eyeglass
eyepiece
glass
hand lens
lens
magnifier
magnifying glass
meniscus
object glass
objective
objective prism
ocular
reader
reading glass
telephoto lens
toric lens
varifocal lens
zoom lens
form
cross section
cupola
pane
pyramid
shard
triangle
Chisholm
ism
schism
scism