Light and Eye

Question 1

Light

Answer 1

A narrow band of electromagnetic radiation that can be conceptualized as a wave or a stream of photons.

Question 2

Photon

Answer 2

A quantum a visible light demonstrating both particle and wave properties.

Question 3

Light can be:

Answer 3

-Reflected, -Refracted, -Scattered, -Transmitted, -Absorbed

Question 4

Name the different parts of the eye.

Answer 4

1. Cornea
2. Aqueous humour
3. Pupil
4. Iris
5. Crystaline lense
6. Vitreous humour
7. Retina

Question 5

Cornea

Answer 5

Transparent film into the eye ball

Question 6

Aqueous humour

Answer 6

Watery fluid into the anterior chamber

Question 7

Pupil

Answer 7

The dark circular opening at the centre of the iris that lets the light enter the eye.

Question 8

Iris

Answer 8

The coloured part of the eye. It regulates the amount of light that enters the eye by expanding and contracting.

Question 9

Crystalline lens

Answer 9

Lense inside your eye that focuses light onto the back of the eye.

Question 10

Vitreous humour

Answer 10

Transparent fluid that fills the large chamber in the posterior part of the eye.

Question 11

Retina

Answer 11

A light-sensitive membrane at the back of the eye that contains rods and cones.

The lens focuses an image on the retina, which then sends the signal to the brain through the optic nerve.

Question 12

Accomodation

Answer 12

A process where the lens changes its shape to alter the refraction.

Question 13

True or false,

Do nearby objects require more refraction?

Answer 13

True

Question 14

True or false,

Do maximal accommodation decreases with age?

Answer 14

True

Question 15

Diopter

Answer 15

Unit of measure of the focusing force of a lense

Question 16

Focal length

Answer 16

Distance between the lens and the point where the points converge.

Question 17

Name 5 eye conditions linked with problems of refraction:

Answer 17

1. Emmetropia
2. Myopia
3. Hyperopia
4. Presbyopia
5. Astigmatism

Question 18

Emmetropia

Answer 18

No sight problem

Question 19

Myopia

Answer 19

Can’t see the distant objects and the focal point is before the retina.

Question 20

Hyperopia

Answer 20

Can’t see the close objects and the focal point is behind the retina.

Question 21

Presbyopia

Answer 21

A type of hyperopia due to old age

Question 22

Astigmatism

Answer 22

Mal-formation of the curves of a part of the eye, usually the cornea. This leads to having many multiple focal points and some lines won’t seem to converge to a common point.