# Shared Flashcard Set

## Details

Test 7
Chapter 18 notes cont.
31
Physics
12/04/2015

Term
 What can explain the relationship between the sine of the angle of incidence and the sine of the angle of refraction of light rays traveling from a vacuum into another medium?
Definition
 Snell's Law
Term
 What is the sine of the angle of incidence divided by the sine of the angle of refraction?
Definition
 index of refraction (n)
Term
 According to Snell, what happens as the angle of incidence increases?
Definition
 the angle of refraction increases
Term
 What happens to light moving from a substance with a smaller index of refraction to a larger index of refraction?
Definition
 it is bent towards the normal
Term
 What occurs when Earth blocks sunlight from the moon?
Definition
 lunar eclipse
Term
 angle of incidence where the refracted ray lies along the boundary of the two media
Definition
 critical angle
Term
 occurs when light passes from a more optically dense medium (higher index of refraction) to a less optically dense medium (lower index of refraction) at an angle so great (greater than critical angle) that there is no refracted ray, so all light reflects back into the region of the higher index of refraction
Definition
 total internal reflection
Term
 What has total internal reflection given rise to?
Definition
 fiber optics
Term
 What has fiber optics made possible?
Definition
 to use light instead of electricity to transmit voices and data
Term
 What hits the internal boundary of the optical fiber at an angle greater than the critical angle, so all of the light is reflected and none is transmitted through the boundary so the light maintains its intensity the distance?
Definition
 light traveling through the transparent fiber
Term
 separation of light into a spectrum by refraction
Definition
 dispersion
Term
 What has one of the highest refractive indices of any material, so it disperses light more than most materials?
Definition
 a diamond
Term
 The higher the index of refraction, what happens?
Definition
 the more light it will dispense
Term
 piece of transparent material that is used to focus light and form an image
Definition
 lens
Term
 thicker at the center than the edges, converging lenses because they refract parallel light rays so that they meet at a point (ex- magnifying glass)
Definition
 convex lens
Term
 thinner in the middle than at edges, diverging lens because rays passing through the lens spread out
Definition
 concave lens
Term
 What kind of image does a concave lens form?
Definition
 virtual, erect, and reduced
Term
 What is the focal length of a concave lens?
Definition
 negative
Term
 What kind of image is formed of an object located beyond the focal point of a convex lens?
Definition
 real, inverted, and smaller
Term
 What kind of image is made of an object closer than the focal point of a convex lens?
Definition
 virtual, upright, and enlarged
Term
 What can be used to ignite paper?
Definition
 converging lens
Term
 inability of spherical lens to focus all parallel rays at a single point
Definition
 lenses exhibit spherical aberration (like mirrors)
Term
 What happens to the light we see?
Definition
 it is transferred through the cornea and lens and focuses on the retina at the back of the eye and specialized cells in the retina absorb this light and send information about the image along the optic nerve to the brain
Term
 What focuses most of the light entering the eye?
Definition
 cornea
Term
 Why does the cornea focus most of the light entering the eye?
Definition
 the air-cornea surface has the greatest difference in indices of refraction
Term
 process where muscles surrounding lens contract or relax changing shape of lens which changes the focal length of the eye
Definition
 accommodation
Term
 focal length of the eye is too short to focus light on the retina and images are formed in front of the retina (cannot see distant objects)
Definition
 nearsightedness or myopia
Term
 What can correct nearsightedness(myopia)?
Definition
 concave lens
Term
 focal length of the eye is too long, images are formed past the retina (cannot see objects that are up close)
Definition
 farsightedness or hyperopia
Term
 What can correct farsightedness(hyperopia)?
Definition
 convex lens
Term
 Who invented the telescope in 1608?
Definition
 Hans Lippershay
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