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# chapter 30 physic

What is refraction? a change in direction where a light ray bends as it enters glass and bends again as it leaves
How is refraction caused? changing the speed of light traveling in different media (of different refractive index)
How does a lens form an image? by bending parallel rays of light that pass through it
what is a lens? a piece of transparent material, such as glass or plastic, that can bend parallel rays of light so that it forms images
What is the shape of a convex lens? thick in the middle and thin around the edges
What does a convex lens do? causes rays of light to converge or come to a focus.
What lens is thick around the edges and thin in the middle? concave
what does a concave lens do? causes rays of light to diverge or spread apart
Where does light appear to come from? a single point
What happens with rays of light that pass through the center of either a converging or a diverging lens? passes straight through without bending
when do rays of light bend more? if they pass through the lens nearer the edges
What is the center of curvature? curved surface of a lens is made as a portion of a spherical surface. the center of the sphere is called the center of curvature of the surface. every point on the surface is equidistant to it.
what is the line joining the centers of curvature on either side of the lens? principal axis
what is focal point? the point at which rays of parallel light converge or seen to converge.
When does a lens have two focal points? light can go through a lens from either side one on either side of the lens
What is the plane passing through either a focal point of a lens that is perpendicular to the principal axis? focal plane
what is focal length? distance between the center of the lens and its focal point
what does the type of image formed by a lens depend on? the shape of the lens and the position of the object
what is an image? a likeness of an object
There are two types of images that can be produced by converging (convex) lenses. what are they? virtual and real
What is a virtual image? an image that can be seen by an observer but cannot be projected onto a screen
What do the light rays not do? they do not come to a focus
When is the image formed? when the object is between the lens and the focal point
What is a real image? an image that can be projected onto a screen because the light rays do come to a focus
What is the orientation of a real image upside down
when is a real image formed? when the object is outside the focal point
Give some uses for converging lenses that form a real image? projecting slides, transparencies or movies on a screen.
What are images formed by diverging lenses like? image is ALWAYS right side up, virtual, smaller.
What is used to construct a ray diagram? the size and location of the object, its distance from the center of the lens, and the focal length of the lens
What can a ray diagram determine? the size and location of an image
When does a ray parallel to the axis pass through the focal point? after refracting in the lens
When a ray goes through the center where does it continue? in a straight line
Where does a ray through the focal point move? parallel to the axis after it refracts
Where is the image formed? where these 3 sample rays intersect or appear to intersect. two of these three rays is sufficient to locate the relative size and location of the image.
Convex lenses: What does the position of the object in the relation to the focal point determine? the size and type of the image
Where do lights of ray diverge? after leaving the lens
What is the image formed by when they diverge after leaving the lens? extending lines backward to where they appear to come from
A ray through the center continues.... straight
Where does a ray that is heading toward the focal point bend? parallel to the axis
Where do the rays diverge? after leaving the lens
How is the image located? by extending lines backwards to the point where they APPEAR to come together
What does a converging lens form? either a real or a virtual image
When a real image is formed, WHERE is the image and object? ALWAYS on opposite sides of the lens
When a virtual image is formed, WHERE is the image and object? ALWAYS on the same side of the lens
Why do most cameras use compound lenses? to minimize distortions called aberrations
What is a common type of telescope? Astronomical
How many lenses does an astronomical lens use? two
What is the eyepiece? the lens which is closest to the eye and magnifies the real image produced by the first lens
What is the image like for an astronomical telescope? inverted
Terrestrial telescope: How many lenses does it use? three or a pair of reflecting prisms to produce an upright image
What do refracting telescopes use? lenses
What do reflecting telescopes use? mirrors
Where does the image form for nearsightedness? it forms in front of the retina
How do you correct nearsightedness? Diverging lenses (concave)
Created by: 16_dnuckolls