1: The sides will be the same when cut in half, but the closest number that could be guessed is 3in
2: Wont matter much, they’re both the same
3: My speculation is that the Black square in 4x6. In order to know the size of a white square we have to do the following
4 + 4 = 8 left vertical side
6 + 6 = 12 upper horizontal side
So we have an answer: The white square is 8x12
Answer:
Glass is the most common material used to construct lens elements, due to its good optical properties and resistance to scratching. Other materials are also used, such as quartz glass, fluorite, plastics like acrylic (Plexiglass), and even germanium and meteoritic glass.
