Chapter 13: Mirrors and Lenses Flashcards
a flat, smooth mirror
plane mirror
an image that your brain perceives even though no light rays pass through the location of that image
virtual image
a mirror whose surface curved inward
concave mirror
an imaginary straight line drawn perpendicular to the surface of the mirror at the mirror’s center
optical axis
the point on the optical axis on which light rays that are initially parallel to the optical axis converge after they reflect off the mirror
focal point
the distance from the center of the mirror to the focal point
focal length
an image that is formed when light rays converge to form the image
real image
a mirror that curves outward, like the back of a spoon
convex mirror
a lens that is thicker in the middle than at the edges
convex lens
a lens that is thinner in the middle and thicker at the edges
concave lens
a transparent covering on your eyeball; causes light rays to bend so that they converge
cornea
the inner lining of your eye, which has cells that convert the light image into electrical signals
retina
a telescope that uses lenses to gather light from distant objects; uses two convex lenses to gather and focus light from distant objects
refracting telescope
a telescope that uses mirrors and lenses to collect and focus light from distance objects
reflecting telescope
a device that uses two convex lenses with relatively short focal lengths to magnify small, close objects
microscope
mirrors form images by
reflecting light rays
why do you see an object?
your eyes detect the light reflected from that object
no light rays pass through the location of what kind of image?
virtual image
a _____ mirror curves inward
concave
a ______ mirror curves outward
convex
lenses form images by…
refracting light rays
in a convex lens, light rays are refracted…
toward the optical axis
the image formed by a convex lens depends on the ______ of the object from the lens
distance
in a concave lens, light rays are refracted…
away from the optical axis
how do the cornea, lens, and retina work together to form an image?
the cornea and the lens focus light onto the retina, which converts the light into electrical signals to be interpreted by the brain
lenses and mirrors are used to make objects…
easier to see
refracting telescope use ___________ to ______ and focus light
two convex lenses; gather
reflecting telescopes use __________, a _________ and a ____________ to ______, ________, and focus light
a concave mirror, plane mirror, convex lens; collect, reflect
placing a telescope in orbit avoids the ____________ of earth’s atmosphere
distorting effects
a microscope uses ________ with ________ to _____ small, close objects
two convex lenses; short focal lengths; magnify
a camera lens focuses light onto…
an image sensor
