Lenses Flashcards
1
Q
What is the shape of a converging lens?
A
Convex
2
Q
What is the shape of a diverging lens?
A
Concave
3
Q
Define ‘Principal Axis’
A
An axis of a lens that passes through its centre, perpendicular to its surface on both sides
4
Q
Define ‘Principal Focus’
A
The principal focus of a converging lens is the point where incident rays parallel to the principal axis of the lens converge
5
Q
Define ‘Focal Plane’
A
The plane perpendicular to the principal axis of the lens on which the principal focus lies
6
Q
Define ‘Focal Length’
A
The distance between the lens axis and the focal plane
