# Physics Chapter 17 & 18 (Test 2)

### 61 terms by cspigos Plus

#### Study  only

Flashcards Flashcards

Scatter Scatter

Scatter Scatter

## Create a new folder

Lenses and Mirrors

### Law of Reflection

the angle of incidence is equal to the angle of reflection

### normal

The line in a ray diagram that shows the direction of the barrier and is drawn at a right angle or perpendicular to the barrier

### incident ray

the ray that comes from an object and strikes a surface

### reflected ray

The ray that reflects off of the mirror and equals the incident ray.

### angle of incidence

angle between an incident ray and the normal to a surface

### angle of reflection

the angle between a reflected ray and a line perpendicular to the reflecting surface at the point of incidence

### specular reflection

a reflection produced by a smooth surface in which parallel lights rays are reflected in parallel

### diffuse reflection

a scattered, fuzzy reflection produced by a rough surface

### plane mirror

a flat, smooth surface from which light is reflected by regular reflection, producing a virtual image that is the same size as the object, has the same orientation and is the same distance from the mirror as the object

### object

a luminous or illuminated source of light rays that are the be reflected by a mirrored surface

### image

the combination of image points in a plane mirror from which the reflected object seems to originate

### virtual image

the image formed of diverging light rays; is always on the opposite side of the mirror from the object

### concave mirror

a mirror that reflects light from its inwardly curving surface and can produce either an upright, virtual image or an inverted, real image

### principal axis

a straight line perpendicular to the surface of a mirror that divides the mirror in half

### focal point

the point where incident light rays that are parallel to the principal axis converge after reflecting from the mirror

### focal length

the position of the focal point with respect to the mirror along the principal axis

### real image

an inverted optical image that is smaller than the object and is formed by the converging of light rays

### spherical aberration

the image defect of a spherical mirror that does not allow parallel light rays far from the principal axis to converge at the focal point, and produces an image that is fuzzy, not sharp

### magnification

the amount that an image is enlarged or reduced in size, relative to the object

### convex mirror

a mirror that reflects light from its outwardly curving surface and produces an upright, reduced, virtual image

### index of refraction

for a medium, is the ratio of the speed of light in a vacuum to the speed of light in that medium

### snell's law of refraction

states that the product if the index of refraction of a medium and the sine of the angle of incidence equals the product of the index of refraction of a second medium and the sine of the angle of refraction

### critical angle

the certain angle of incidence in which the refracted light ray lies along the boundary between two media

### total internal refraction

occurs when light traveling through an area with a higher index of refraction to an area with a lower index of refraction hits a country at an angle that exceeds the critical angel and all light reflects back into the area with the higher index of refraction

### dispersion

the separation of white light into a spectrum of colors by such means as a bass prism or water droplets in the atmosphere

### lens

a piece of transparent material, such as glass or plastic, that is used to focus light and form an image

### convex lens

a converging lens, thicker at its center than at its edges, that refracts parallel light rays so the rays meet at a point when surrounded by material with a lower index of refraction; can produce a smaller, inverted, real image, or a larger, upright, virtual image

### concave lens

a diverging lens, thinner at its middle than its edges, that spread out light rays passing through it when surrounded by material with a lower index of refraction; produces a smaller, virtual, upright image

### thin lens equation

states that the inverse of the focal length of a spherical lens equals the sum of the inverses of the image position and the object position (1/f= 1/di + 1/do)

### nearsightedness

a vision defect in which a person cannot see distant objects because images are focused in front of the retina, can be corrected with a concave lens

### farsightedness

a vision defect in which a person cannot see close objects clearly because images are formed behind the retina, can be corrected with a convex lens

### fjsak

explain why light bends when it passes from one medium to another, and relate this to snell's law of refraction

### fjdaksfjlksa

understand what the index of refraction tells us

### jfksdla

explain total internal reflection and under what circumstances the light would be reflected

### efds

explain how convex lens can produce either real or virtual images

### fjsdkalss

explain how concave lenses always produce virtual images

### un

understand how ray diagrams can be used to locate images formed by concave and convex lenses

### fjds

understand how the eye focuses light to form an image

### fj

explain nearsightedness and farsightedness and how eyeglass lenses correct these defects

### GAH

explain the law of reflection with the use of a ray diagram

### b

explain what happens when light strikes a smooth surface versus a rough surface

### f

explain how plane mirrors always produce virtual images

### yo

describe the properties of concave and convex mirrors

### fds

explain how concave mirror can produce either real or virtual images

### fffff

explain how convex mirrors always produce virtual images

### j

describe some of the uses of spherical mirrors

### bn

understand how ray diagrams can be used to locate images formed by plane, concave, and convex mirrors

### total internal refraction

when light strikes the boundary of a medium with a lower index of refraction at an angle so great that there is no refracted ray, _________ occurs

### dispersion

the separation of light into its spectrum is _____

### farsightedness

the condition where the focal length of the eye is too long is called ____

### snells law of refraction

the relationship of the angle of incidence to the angle of refraction is stated in ____

### lens

a transparent material that has an index of refraction greater than air is a(n) _____

### index of refraction

_____ is a property of a medium that affects the speed of light in the medium

### nearsightedness

the condition where the focal length of the eyes is too short is called ____

### critical angle

the ___ describes an angle of incidence at which a refracted ray lies along the boundary of a substance

### thin lens equation

the ___ relates the focal length of a spherical thin lens to the object position and image position

### concave lens

a transparent refracting device that is thinner in the middle than at the edges is a(n) _______

### convex lens

a transparent refracting device that is thicker in the middle than at the edges is a(n) _______

### normal

the angle of incidence is the angle between the incoming light beam and the ______

### does

the speed of light __ depend on the medium through which the light is traveling

### refraction

_____ involves the bending

Example: