Lens
NOTES
Lenses
 A _______________ is made of transparent material, such as glass or plastic, with an
_______________ of refraction _______________ than that of air, causing light to bend (refract) as it
passes through it.
 A lens has a _______________ surface on one or both sides.
Types of Lenses
 _______________
 _______________
 _______________
 _______________
Convex vs. Concave Lenses
 A _______________ lens causes parallel light rays to eventually _______________ and a
_______________ lens causes parallel light rays to eventually _______________.
Convex Lens: Beyond 2F
Image is _______________, _______________, and _______________.
Convex Lens: @ 2F
Image is _______________, _______________, and _______________ size.
Convex Lens: Between FP and 2F
Image is _______________, _______________, and _______________.
Convex Lens: @FP
__________ image is formed.
Convex Lens: Between FP and Lens
The refracted light rays _______________. The image forms on the _______________ side of the lens at the
object. The image is _______________, _______________, and _______________.
The Concave Lens
Rays _______________ after they hit the lens. Image will _______________ be _______________,
_______________, and _______________.
Applications that Use Lenses
 Hand lenses/_______________ glasses
 _______________
 Refracting _______________
 Binoculars
 _______________
 Microscopes
 Corrective _______________ and _______________ lenses
Nearsightedness
 _______________ (Myopia) occurs when the eyeball is too _______________, so focal length is too
_______________.
 Image forms in _______________ of the retina; causes _______________ objects to be blurry.
 Corrected by a _______________ lens that forces light to _______________ to a farther point on back
of retina.
Farsightedness
 _______________ (Hyperopia) occurs when the eyeball is too _______________ so focal length is too
_______________, also happens with aging as muscles holding the shape of lens relax and allow it to
flatten.
 Image forms _______________ wall of the retina; causes objects located _______________ to the eye
to become blurry.
 Corrected by _______________ lens that forces light to _______________ at a closer point on the back
of retina.