What does a concave lens look like?
a. flat on one side and bulges out on the other side
b. the same thickness in the middle and at the edges
c. thicker in the center than at the edges
thinner in the center than at the edges
a. flat on one side and bulges out on the other side
b. the same thickness in the middle and at the edges
c. thicker in the center than at the edges
thinner in the center than at the edges