Question

Which of the following represents a concave lens?

A. -f
B. +f
C. +di
D. -d

Answer 1

Concave has negative focal point because the light rays reflect on the side of the object so it is considered negative as you could see in the pics attached

Answer 2

Converging is another name for concave lens and diverging is another name for convex lens

Answer 3

so would it be -f?

Answer 4

@Nali

Answer 5

yes