Converging and Diverging Lenses (Leaving Cert Physics): Flashcards
📚Flashcards
Practise the cards
15 cards from this deck
ShowHide
Practise the cards
15 cards from this deck
What are lenses?
What are lenses?
Curved pieces of transparent material that bend light rays
Shape of converging (convex) lens
Shape of converging (convex) lens
Thicker in middle than at edges
Shape of diverging (concave) lens
Shape of diverging (concave) lens
Thinner in middle than at edges
How to identify lens type by shape
How to identify lens type by shape
Thicker in middle = converging; thinner = diverging
Optic centre of a lens
Optic centre of a lens
Central point where light passes through without bending
Principal axis of a lens
Principal axis of a lens
Line through optic centre, perpendicular to lens surface
Principal focus (focal point)
Principal focus (focal point)
Point where parallel rays converge or appear to diverge from
Focal length
Focal length
Distance from optic centre to principal focus
Effect of converging lens on parallel rays
Effect of converging lens on parallel rays
Brings them together at principal focus
Effect of diverging lens on parallel rays
Effect of diverging lens on parallel rays
Spreads them apart
Focal length vs lens power relationship
Focal length vs lens power relationship
Shorter focal length = greater converging/diverging power
Ray rule 1: Ray through optic centre
Ray rule 1: Ray through optic centre
Continues straight without bending
Ray rule 2: Parallel ray to principal axis
Ray rule 2: Parallel ray to principal axis
Bends through principal focus on far side
Ray rule 3: Ray through focus before lens
Ray rule 3: Ray through focus before lens
Emerges parallel to principal axis
Common lens application examples
Common lens application examples
Eyeglasses, cameras, telescopes, microscopes, binoculars