Chapter 14: Mirrors and Lenses

camera

A(n) ________ works by gathering and bending light with a lens.

Astigmatism

________ causes blurry vision at all distances.

Cornea

________: causes light rays to bend so that they converge.

concave mirror

When an object is farther from a(n) ________ than twice the focal length, the image that is formed is real, smaller, and upside down, or inverted.

Corrective lenses

________ also have an uneven curvature, canceling out the effect of an uneven cornea.

Concave Lenses

________: thinner in the middle and thicker at the edges.

focal point

A light placed at the ________ is reflected in a beam.

convex mirror

A(n) ________ is said to have a wide field of view.

Optical Axis

________: an imaginary straight line drawn perpendicular to the surface of the mirror at its center.

telephoto

A(n) ________ lens creates a larger image of an object than a wide- angle lens does.

Hubble telescope

The ________ is a type of reflecting telescope that uses two mirrors to collect and focus light to form an image.

Virtual Image

________: An image which your brain perceives even though no light rays pass through it.

real image

Reflecting telescopes use two mirrors to create a(n) ________, which then is magnified by a convex lens.

Microscope

________: uses two convex lenses with relatively short focal lengths to magnify small, close objects.

Concave lenses

________ are used in some types of eyeglasses and some telescopes.

concave mirror

A flashlight uses a(n) ________ to create a beam of light.

convex mirror

The reflected rays diverge and never meet, so the image formed by a(n) ________ is a virtual image.

optical axis

When light rays travel toward the mirror parallel to the ________, they reflect through the focal point.

virtual image

The ________ formed by a plane mirror is always upright and appears to be as far behind the mirror as the object is in front of it.

microscope

A(n) ________ uses two convex lenses to magnify small objects.

light rays

When ________ approach a convex lens traveling parallel to its optical axis, the rays are refracted toward the center of the lens.

Convex Mirror

________: A mirror that curves outward like the back of a spoon.

concave mirror

A(n) ________ has an optical axis and a focal point.

telescope

A(n) ________ uses a lens or a concave mirror that is much larger than your eye to gather more of the light from distant objects.

convex mirror

Light rays that hit a(n) ________ diverge, or spread apart, after they are reflected.

concave mirror

The image that is formed by a(n) ________ changes depending on where the object is located relative to the focal point of the mirror.

Plane Mirror

a flat, smooth mirror

Virtual Image

An image which your brain perceives even though no light rays pass through it

Concave Mirror

the surface of a mirror is curved inward

Optical Axis

an imaginary straight line drawn perpendicular to the surface of the mirror at its center

Focal Point

a point on the optical axis

Focal Length

The distance from the center of the mirror to the focal point

Real Image

formed when light rays converge to form the image

Convex Mirror

A mirror that curves outward like the back of a spoon

Convex Lenses

thicker in the middle than at the edges

Concave Lenses

thinner in the middle and thicker at the edges

Cornea

causes light rays to bend so that they converge

Retina

the inner lining of your eye

Refracting Telescope

uses two convex lenses to gather and focus light from distant objects

Reflecting Telescope

uses a concave mirror, a plane mirror, and a convex lens to collect and focus light from distant objects

Microscope

uses two convex lenses with relatively short focal lengths to magnify small, close objects