Lenses

Difference between Bifocals and Trifocals
Bifocals are lenses that contain two lens powers, while trifocals have three. In bifocals, a small portion of the lower part of the lens contains the ...
Difference Between Plastic and Glass lenses
plastic lenses is a decision to make based on durability, weight, and scratch resistance. ... Glass lenses are less likely to scratch than plastic one...
Difference Between Converging and Diverging Lens
Converging lenses are lenses which converge the light rays coming towards them, whereas diverging lenses are lenses which diverge the rays coming towa...