1. End of Lesson 3

2. 11.4 The Eye and Vision
cornea
pupil
iris
retina
pigment

3. How the Eye Forms an Image
11.4 The Eye and Vision
How the Eye Forms an Image
As light enters your eye, lenses in your eye focus light to produce an image on the back of your eye.
Special cells at the back of the eye convert the image into electrical signals that travel to your brain.

4. 11.4 The Eye and Vision
Cornea
Light enters your eye through the cornea, which is a clear area of the sclera—the outer layer of the eye.
The Eye

5. 11.4 The Eye and Vision
Parts of the Eye
Cornea

6. Iris The pupil is the dark opening into the interior of your eye.
11.4 The Eye and Vision
Iris
The pupil is the dark opening into the interior of your eye.
The pupil is surrounded by the iris—the colored part of your eye behind the cornea.

7. Lens The lens of your eye is convex and flexible.
11.4 The Eye and Vision
Lens
The lens of your eye is convex and flexible.
The ciliary muscles attached to the lens change its shape depending on the distance of the object being looked at.

8. 11.4 The Eye and Vision
Retina
The retina is a sheet of light-sensitive cells in the back of the eye.
Rod cells respond to dim light and cone cells enable you to see colors.

9. 11.4 The Eye and Vision
Seeing Color
The response of cone cells to different wavelengths of light cause you to see objects as having color.
Three types of cone cells:
One responds to the wavelengths of red and yellow light, causing you to see red.
One responds to yellow and green light, causing you to see green.
One responds to blue and violet light, causing you to see blue.

10. 11.4 The Eye and Vision
Pigment Colors
A pigment is a material used to change the color of other materials or objects.
The color of a pigment depends on the wavelengths of the light it reflects.

11. 11.4 The Eye and Vision
Pigment Colors (cont.)
Reflecting Light

12. 11.4 The Eye and Vision
Color Printing
The pictures in magazines are formed by many tiny dots of color.
Usually, the primary colors of pigments, as well as black, are used.

13. Common Vision Problems
11.4 The Eye and Vision
Common Vision Problems
Color deficiency: either lack red or green cones, or the cones do not function correctly

14. Common Vision Problems (cont.)
11.4 The Eye and Vision
Common Vision Problems (cont.)
Nearsightedness: cannot see faraway objects clearly

15. Common Vision Problems (cont.)
11.4 The Eye and Vision
Common Vision Problems (cont.)
Farsightedness: cannot see nearby objects clearly
How are lenses used to correct vision?

16. What controls the amount of light that enters your eye?
11.4 The Eye and Vision A B C D
What controls the amount of light that enters your eye?
A ciliary muscles
B cornea
C sclera
D iris
Lesson 4 Review

17. What part of the eye enables you to see colors? A pupil B rod cells
11.4 The Eye and Vision A B C D
What part of the eye enables you to see colors?
A pupil
B rod cells
C cone cells
D optic nerve
Lesson 4 Review

18. Which describes a nearsighted eye?
11.4 The Eye and Vision A B C D
Which describes a nearsighted eye?
A it is missing some cone cells or the cones don’t function properly
B the eyeball is too short for the lens to form a clear image
C the rods at the back of the eye do not function properly
D the eyeball is too long for the lens to form a clear image
Lesson 4 Review

19. End of Lesson 4

20. Chapter Resources Menu
Chapter Assessment
California Standards Practice
Concepts in Motion
Image Bank
Science Online
Interactive Table
Virtual Lab
BrainPOP
Click on a hyperlink to view the corresponding feature.

21. What is the wavelength range of visible light? A 700–400 nm C D
What is the wavelength range of visible light?
A 700–400 nm
B 200–600 nm
C 300–900 nm
D 800–300 nm
Chapter Assessment 1

22. What occurs when light waves strike a material and pass through it? B C D
What occurs when light waves strike a material and pass through it?
A reflection
B absorption
C transmission
D scattering
Chapter Assessment 2

23. Which is true according to the law of reflection? B C D
Which is true according to the law of reflection?
A if light is not refracted, it is reflected
B parallel rays of light remain parallel when they are reflected
C the angle of incidence equals the angle of reflection
D the angle of reflection is twice the angle of incidence
Chapter Assessment 3

24. A upside down and larger than the object
Which describes the image formed by an object more than two focal lengths from a convex lens?
A upside down and larger than the object
B upside down and smaller than the object
C right side up and smaller than the object
D right side up and larger than the object
Chapter Assessment 4

25. Which part of the eye contains light-sensitive rods and cones? B C D
Which part of the eye contains light-sensitive rods and cones?
A sclera
B cornea
C optic nerve
D retina
Chapter Assessment 5

26. What property of a wave increases as wavelength decreases? A crest
SCI 6.a A B C D
What property of a wave increases as wavelength decreases?
A crest
B trough
C frequency
D amplitude
CA Standards Practice 1

27. In which order does light pass through the parts of the eye?
SCI 6.b A B C D
In which order does light pass through the parts of the eye?
A lens, retina, pupil
B lens, pupil, retina
C retina, lens, pupil
D pupil, lens, retina
CA Standards Practice 2

28. SCI 6.c A B C D
Which light waves are refracted the least after passing through a prism?
A red
B violet
C yellow
D blue
CA Standards Practice 3

29. SCI 6.f A B C D
What occurs when you look at an object at the bottom of a pool of water?
A reflection
B refraction
C absorption
D scattering
CA Standards Practice 4

30. What type of lens is present in both your eye and a microscope?
SCI 6.d A B C D
What type of lens is present in both your eye and a microscope?
A objective
B eyepiece
C convex
D concave
CA Standards Practice 5

31. Bending Light Reflecting Light
Concepts in Motion 1

32. Concepts in Motion 2

33. Image Bank

34. Image Bank

35. Interactive Table
Parts of the Eye

36. End of Resources