Chapter 11 - Lenses and The Eye

Question 1

What does a converging/convex lens do to light?

Answer 1

Focuses parallel light rays to the principal focus

Question 2

What does a diverging/concave lens do to light

Answer 2

Spreads parallel light rays out as if they had just come from the principal focus

Question 3

When does a converging/convex lens form a real image?

Answer 3

When the object is further away than the principal focus

Question 4

What image is formed by a diverging/concave lens?

Answer 4

Virtual

Question 5

When does a coverging/convex lens form a virtual image?

Answer 5

When the object is nearer to the lens than the principal focus

Question 6

When would you use a ray diagram?

Answer 6

To find the position and nature of he image formed via a lens

Question 7

Describe the image formed when the object is placed between the converging/convex lens and its principal focus

Answer 7

Virtual, upright, magnified and on the same side of the lens as the object

Question 8

What type of lens does a camera use?

Answer 8

Converging/convex

Question 9

What type of lens does a magnifying glass use?

Answer 9

Converging/convex

Question 10

What values do real images and converging/convex lenses have?

Answer 10

Positive values

Question 11

What values do virtual images and diverging/concave lenses have?

Answer 11

Negative values

Question 12

Where is light focused to on the eye via what?

Answer 12

Retina via cornea and eye lens

Question 13

What muscles change the shape of the eye lens?

Answer 13

Ciliary muscles

Question 14

What is the range of vision of the human eye?

Answer 14

25cm-infinite

Question 15

What type of lens does a camera and eye have?

Answer 15

Converging/convex

Question 16

What type of focusing adjustment do the camera and the eye have?

Answer 16

Adjustment of the lens position, and ciliary muscles alters lens thickness

Question 17

What type of image do the eye and camera form?

Answer 17

Real, inverted, magnification less than 1

Question 18

What type of image detection do the camera and eye have?

Answer 18

Photographic film or CCD sensors, light sensitive cells in the retina

Question 19

What type of brightness control do the camera and the eye have?

Answer 19

Adjustment of the aperture, iris controls width of they eye pupil

Question 20

How can you correct short-sightedness?

Answer 20

Diverging/concave lens

Question 21

How can you correct long-sightedness?

Answer 21

Converging/convex lens

Question 22

How can you make the lens material thinner and flatter?

Answer 22

By increasing the refractive index

Question 23

Where does the image form in short-sightedness?

Answer 23

Short of the retina

Question 24

Where does the image form in long-sightedness?

Answer 24

Long of the retina