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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
Note 
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