Question

What is the focal length of a lens?
the distance between the object and the image

distance between the object and the center of the lens

the distance between the center of the lens and the image

the distance between the focal point and the center of the lens

Answer 1

Every distance measure frm the center of lens

Answer 2

Distance frm the center of a lens to focal point is called focal length

Answer 3

ty

Answer 4

ty