Lenses and the eye

Question 1

Accommodation

Answer 1

The ability of the lens of the eye to change shape

Question 2

Aqueous humour

Answer 2

Lies between the cornea and the lens. It is a clear, watery fluid produced by the ciliary body to lubricate the lens and cornea

Question 3

Concave lens

Answer 3

A lens that curves inwards

Question 4

Convex lens

Answer 4

A lens that bulges outwards

Question 5

Cornea

Answer 5

Bends light into the lens. Lies in front of the iris. Is clear

Question 6

Iris

Answer 6

The coloured part of the eye. It contains the dilator muscle and sphincter muscle as part of its structure

Question 7

Focal length

Answer 7

W

Question 8

Focal point

Answer 8

W

Question 9

Focus

Answer 9

W

Question 10

Lens

Answer 10

A flexible structure that enables light to be focused on the retina

Question 11

Long-sightedness (hyperopia)

Answer 11

The ability to see distant object clearly; close object appear blurry

Question 12

Optic nerve

Answer 12

Caries the electrical signals from the retina to the brain

Question 13

Principal axis

Answer 13

W

Question 14

Ray diagrams

Answer 14

A

Question 15

Real image

Answer 15

An image formed when rays of light actually meet

Question 16

Retina

Answer 16

The cells on the retina a called come and rod cells absorb light rays and turn them into electrical signals

Question 17

Sclera

Answer 17

White of the eye

Question 18

Short-sightedness (myopia

Answer 18

The ability to see close objects clearly; distant objects appear blurry

Question 19

Vitreous humour

Answer 19

Clear fluid between the lens and retina