Which statement is a characteristic of a concave lens

"A concave lens is thinner at the center than it is at the edges."

If this isn't on the list of choices, that's tough.  We can't help you choose the best one if we don't know what any of them is.

part 1: which substance has a higher solubility?

a

smallest amount left undissolved atall temps in table shown most has dissolved high sol'by

you can cut your hand off if your not