Light and Optical Systems Topics 4-5 Test

Question 1

What is the definition of accommodation?

Answer 1

the process of changing the shape of the lens (in the eye) to adjust for different distances from an object being viewed (pg.215)

Question 2

What is the definition of aperture?

Answer 2

The opening in the diaphragm of a camera;can let more light reach the film by opening wider (pg.216)

Question 3

What is the definition of blind spot?

Answer 3

The point where the optic nerve enters the retina; has no light-sensing cells (pg.217)

Question 4

What is the definition of concave lens?

Answer 4

A lens that is thinner and flatter in the middle than around the edges; causes refracting rays to come together (pg.208)

Question 5

What is the definition of convex lens?

Answer 5

A lens that is thicker in the middle than around the edges; causes refracting rays to come together (pg.208)

Question 6

What is the definition of diaphragm?

Answer 6

In a camera or microscope, the lens that works as a magnifying glass to enlarge the image (pg.216)

Question 7

What is the definition of eyepiece lens?

Answer 7

In a telescope or microscope, the lens that works as a magnifying glass to enlarge the image (pg.221)

Question 8

What is the definition of far point?

Answer 8

(of the eye) the greatest distance at which an object is in focus (pg.215)

Question 9

What is the definition of far-sighted?

Answer 9

Unable to see close objects clearly (pg.210)

Question 10

What is the definition of focus?

Answer 10

To bring rays of light to a point (pg.210)

Question 11

What is the definition of iris?

Answer 11

In the eye, the colored ring; works like the diaphragm of a camera (pg.216)

Question 12

What is the definition of iris reflex?

Answer 12

The natural adjustment in the eye’s pupil size in response in varying light levels (pg.217)

Question 13

What is the definition of lens?

Answer 13

A curved piece of transparent material, usually glass or plastic (pg.208)

Question 14

What is the definition of near point?

Answer 14

(of the eye) the shortest distance at which an object is in focus (pg.215)

Question 15

What is the definition of near-sighted?

Answer 15

Unable to see distant objects clearly (pg.210)

Question 16

What is the definition of objective lens?

Answer 16

The convex lens in a refracting telescope or microscope (pg.221)

Question 17

What is the definition of objective mirror?

Answer 17

The mirror in a reflecting telescope; also called the primary mirror (pg.221)

Question 18

What is the definition of optic nerve?

Answer 18

The nerve that connects the eye to the brain (pg.217)

Question 19

What is the definition of prisms?

Answer 19

In binoculars, glass blocks serving as plane mirrors; allow binoculars to be made shorter than telescopes (pg.223)

Question 20

What is the definition of pupil?

Answer 20

The opening in the eye; appears as the dark center of the eye (pg.216)

Question 21

What is the definition of reflecting telescope?

Answer 21

A telescope having a concave mirror to collect rays of light from a distant object (pg.221)

Question 22

What is the definition of refracting telescope?

Answer 22

A telescope having a convex lens to collect and focus light from a distant object, and an eyepiece to magnify the image (pg.221)

Question 23

What is the definition of retina?

Answer 23

A light-sensitive area at the back of the eye (pg.210)

Question 24

What is the definition of shutter?

Answer 24

In a camera, a device that opens the aperture to allow light to reach film (pg.216)