Chapter 8: Light Technologies

Question 1

Convex Mirror

Answer 1

Bulges outward

The objects appear closer and smaller

Question 2

Give examples of how convex mirrors are used

Answer 2

i. security devices
ii. side view mirrors on cars
iii. telescopes

Question 3

Concave Mirror

Answer 3

Curves inward
Objects close to the mirror are seen upright and larger than the object
Objects far away appear inverted and smaller than it is

Question 4

What is a lens?

Answer 4

A curved piece of transparent material, such as glass or plastic. Light refracts when passing through a lens

Question 5

Concave lens

Answer 5

Thinner in the middle causing light to spread out

Question 6

Convex lens

Answer 6

Thicker in the middle causing light to converge

Question 7

What lens is found in the human eye?

Answer 7

Convex

Question 8

How does the human eye focus?

Answer 8

Refraction

Question 9

Retina

Answer 9

Inner most layer

Where light is focused onto

Question 10

Ciliary muscle

Answer 10

Focuses lens

Changes shape

Question 11

Cornea

Answer 11

A covering

Begins bending the light

Question 12

Pupil

Answer 12

Where light goes in

Question 13

Aqueous humor

Answer 13

Fluid that helps the cornea keep its shape

Question 14

Iris

Answer 14

Controls how much light enters the eye

Question 15

Lens

Answer 15

Focuses the image (can change shape to do so)

Question 16

Optic disc

Answer 16

Where the optic nerve connects to the brain also called the blindspot

Question 17

Optic Nerve

Answer 17

Takes info from the retina to the brain

Question 18

Sclera

Answer 18

Protective covering

Question 19

If you are near sighted your eye is…

Answer 19

too long

Question 20

If you are far sighted your eye is too…

Answer 20

short

Question 21

What lens corrects near sightedness? How?

Answer 21

Concave by pushing the image a little further back in the eye

Question 22

What lens corrects far sightedness? How?

Answer 22

Convex lens cause the image to not fall behind the retina

Question 23

Why do people need reading glasses as they get older?

Answer 23

Because their ciliary muscles stiffen. They usually need convex lens.

Question 24

What is the far point?

Answer 24

The farthest point an image is in focus

Question 25

What is iris reflex?

Answer 25

When the iris adjusts naturally to available light,

Question 26

Statement below

Answer 26

Tear fluid helps refract light Remember that!!!!!!!!!!!!!

Question 27

When was the first telescope invented?

Answer 27

1680

Question 28

What types of telescopes are there and what do they use?

Answer 28

``` Refracting = Lens (specifically convex) Reflecting = Mirror (specifically concave) ``` Further explanation on reflecting: The mirror is called a primary or objective mirror. It forms a real image, which is then magnified by the eye piece lens. Further explanation on refracting: In a refracting telescope the convex lens (also called the objective lens) is used to focus light. A second lens called the eye piece lens works like a magnifying glass to enlarge the image.

Question 29

What are binoculars?

Answer 29

A pair of reflecting telescopes. The plane mirrors are replaced with 2 prisms.

Question 30

How are microscopes and telescopes similar? How are they different?

Answer 30

A. They both see things up close and both have mirrors. B. Telescopes look at things that are far away and normally quite large. Microscopes look at things that are microscopic.

Question 31

Attitude

Answer 31

In optics, the position (upright or upside down) of an image in relation to the object it reflects

Question 32

Real image | Virtual image

Answer 32

Real image appears in front and is found with concave mirrors Virtual image appears behind and is found with plane mirrors and convex mirrors.