Chapter 13: Mirrors and Lenses

Question 1

a flat, smooth mirror

Answer 1

plane mirror

Question 2

an image that your brain perceives even though no light rays pass through the location of that image

Answer 2

virtual image

Question 3

a mirror whose surface curved inward

Answer 3

concave mirror

Question 4

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

Answer 4

optical axis

Question 5

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

Answer 5

focal point

Question 6

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

Answer 6

focal length

Question 7

an image that is formed when light rays converge to form the image

Answer 7

real image

Question 8

a mirror that curves outward, like the back of a spoon

Answer 8

convex mirror

Question 9

a lens that is thicker in the middle than at the edges

Answer 9

convex lens

Question 10

a lens that is thinner in the middle and thicker at the edges

Answer 10

concave lens

Question 11

a transparent covering on your eyeball; causes light rays to bend so that they converge

Answer 11

cornea

Question 12

the inner lining of your eye, which has cells that convert the light image into electrical signals

Answer 12

retina

Question 13

a telescope that uses lenses to gather light from distant objects; uses two convex lenses to gather and focus light from distant objects

Answer 13

refracting telescope

Question 14

a telescope that uses mirrors and lenses to collect and focus light from distance objects

Answer 14

reflecting telescope

Question 15

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

Answer 15

microscope

Question 16

mirrors form images by

Answer 16

reflecting light rays

Question 17

why do you see an object?

Answer 17

your eyes detect the light reflected from that object

Question 18

no light rays pass through the location of what kind of image?

Answer 18

virtual image

Question 19

a _____ mirror curves inward

Answer 19

concave

Question 20

a ______ mirror curves outward

Answer 20

convex

Question 21

lenses form images by…

Answer 21

refracting light rays

Question 22

in a convex lens, light rays are refracted…

Answer 22

toward the optical axis

Question 23

the image formed by a convex lens depends on the ______ of the object from the lens

Answer 23

distance

Question 24

in a concave lens, light rays are refracted…

Answer 24

away from the optical axis

Question 25

how do the cornea, lens, and retina work together to form an image?

Answer 25

the cornea and the lens focus light onto the retina, which converts the light into electrical signals to be interpreted by the brain

Question 26

lenses and mirrors are used to make objects…

Answer 26

easier to see

Question 27

refracting telescope use ___________ to ______ and focus light

Answer 27

two convex lenses; gather

Question 28

reflecting telescopes use __________, a _________ and a ____________ to ______, ________, and focus light

Answer 28

a concave mirror, plane mirror, convex lens; collect, reflect

Question 29

placing a telescope in orbit avoids the ____________ of earth’s atmosphere

Answer 29

distorting effects

Question 30

a microscope uses ________ with ________ to _____ small, close objects

Answer 30

two convex lenses; short focal lengths; magnify

Question 31

a camera lens focuses light onto…

Answer 31

an image sensor