Thin Lenses

Converging

Both sides of _________________ lens curve outwards

Diverging

Both sides of ________________ lens curve inward

Focal point

Point where light rays meet

Focal length

Distance from center of lens to focal point

Convex

Other name for converging lense

Concave

Other name for diverging lens

1/f=1/do+1/di

Thin lens equation

Focal length

( 1/f = 1/do + 1/di )
f

Object distance (distance from object to lens)

( 1/f = 1/do + 1/di )
do

Image distance (distance from image to lens)

( 1/f = 1/do + 1/di )
di

do/di

ho/hi =

Object height

( do/di = ho/hi )
ho

Image height

( do/di = ho/hi )
hi

+

Converging lenses have _____ focal lengths

-

Diverging lenses have _____ focal lengths

+

With a single lens, object distance is always _____

+

Image distance is _____ if image and object are on opposite sides of lens

-

Image distance is _____ if image and object are on same sides of lens

M=-di/do (M=magnification)

Magnification equation

+

_____ magnification value means image is right side up

-

_____ magnification value means image is up side down

Lens power (p)

1/f =

Diopter

Unit of measurement for lens power (1/m)

Spherical abberation

Light rays do not perfectly intersect at focal point; results in blurred image

Chromatic abberation

Different colors of light are bent to different points

Cornea

Outer lens of eye

Lens

Inner lens of eye that makes fine adjustments to image

Ciliary muscle

Smooth muscle that alters shape of lens; allowing it to adjust image

Retina

Light sensitive layer of the eye that image is projected onto

Optic nerve

Nerve that carries neural impulses from the eye to the brain

Nearsighted

________________ vision is corrected with concave lens glasses

Farsighted

_______________ vision is corrected with convex lens glasses