Unit C: Section 4.0 Flashcards Preview

Grade 8: Science > Unit C: Section 4.0 > Flashcards

Flashcards in Unit C: Section 4.0 Deck (49):
1

What is the function of the cornea?

Protect all the sensitive parts of the eye

2

What is the function of the iris?

To control the size of the pupil

3

What is the function of the pupil?

To let in more or less light

4

What is the function of the ciliary muscle?

To make the lens thicker or thinner

5

What is the function of the lens?

To focus the light onto the retina

6

What is the purpose of the retina?

To send the image to the optic nerve

7

What is the function of the optic nerve?

To send the image to the brain

8

What does it mean when the pupil dilates?

Becomes bigger

9

Which part of the camera is like the retina?

The film

10

What part of the camera is like the iris?

The diaphragm

11

What part of the camera is like the eyelid?

The shutter

12

What part of the camera is like the lens?

The lens!

13

What part of the camera is like the pupil?

The aperture

14

What is the retina?

It is the sensitive layer that like strikes. It is filled with photo receptors

15

What are rods sensitive to?

Light

16

What are cones sensitive to?

Color

17

Why can't you see colors in the dark?

Because comes don't work very well in low light

18

What happen when light strikes the retina?

The photoreceptors send light to the optic nerve

19

What is farsightedness?

When the light doesn't focus early enough

20

What is nearsightedness?

When the light focuses to early

21

How is farsightedness corrected?

It is fixed with convex lenses

22

How is nearsightedness corrected?

It is fixed with concave lenses

23

How does laser eye surgery work?

The surgeon uses a laser to reshape the cornea

24

How do night vision goggles work?

Light goes through light intensifiers and then through a phosphor screen which causes them to glow green

25

What are the parts of the eye?

Cornea
Iris
Pupil
Lens
Ciliary muscle
Retina
Optic nerve

26

What are camera eyes?

Any eye that has a cornea, lens, and a retina

27

How many comes do humans have?

3: each different ones sense red, green, blue

28

How many different cones do birds have?

5

29

What is tapetum lucidum?

It's basically a mirror inside the eye that reflects light outside of the eye

30

What organisms have compound eyes?

Insects and crustaceans

31

What is a compound eye?

Eyes that are made of many ommatidium

32

What does an ommatidium look like?

A long tube with a lens on the outer surface

33

What are advantages to compound eyes?

You can see in all directions
You can see motion very well

34

What are downsides to compound eyes?

Can't form a single image

35

What are camera eyes?

Any eye that has a cornea, lens, and a retina

36

How many comes do humans have?

3: each different ones sense red, green, blue

37

How many different cones do birds have?

5

38

What is tapetum lucidum?

It's basically a mirror inside the eye that reflects light outside of the eye

39

What organisms have compound eyes?

Insects and crustaceans

40

What is a compound eye?

Eyes that are made of many ommatidium

41

What does an ommatidium look like?

A long tube with a lens on the outer surface

42

What are advantages to compound eyes?

You can see in all directions
You can see motion very well

43

What are downsides to compound eyes?

Can't form a single image

44

What is digital imaging?

The process of creating a big picture out of small images

45

What happens when a computer receives an image?

It divides them into pixels and then changes it to numbers

46

What does a computer do to tell color?

It assigns the color a number

47

What is the resolution?

It refers to the number of pixels per unit area

48

What is the difference between cameras and digital cameras?

Instead of light falling on agile it falls onto a charge-coupled device or CCD

49

How does a charge coupled device work?

As light falls into each square it creates a small amount of electricity. It's then created into digital information like numbers