Optics

Question 0

A concave mirror magnifies or enables a wider angle?

Answer 0

Magnifies eg. Dentist mirror

Question 1

Define rarefraction

Answer 1

When light goes through a denser material, it bends TOWARDS the normal.

Question 2

Convex mirrors magnify or enable wide angle?

Answer 2

Enable wide angle. Eg. Security mirror

Question 3

A virtual image is?

Answer 3

Cannot be captured on screen

Question 4

A Real image is?

Answer 4

Can be captured on screen

Question 5

Define Transparent

Answer 5

Fully allows light to pass through (glass)

Question 6

Non luminous

Answer 6

Does Not produce it’s own light (moon)

Question 7

Luminous

Answer 7

Produces it’s own light (sun)

Question 8

Translucent

Answer 8

Partially allows light to pass through (bathroom mirror)

Question 9

Opaque

Answer 9

Doesn’t not allow light to pass through (metal)

Question 10

Why is a wall yellow?

Answer 10

When white light heats the wall, the yellow wave length is reflected, all other wave lengths being absorbed

Question 11

To have clear sight, the image must be focused on what?

Answer 11

The retina

Question 12

A thick lens has what?

Answer 12

A shorter focal length

Question 13

A thin lens has what?

Answer 13

A longer focal length

Question 14

For someone that is short sighted, what lens do they need?

Answer 14

A CONCAVE

Question 15

For a longsighted, what lens do they need?

Answer 15

A CONVEX

Question 16

What is the scattering of light?

Answer 16

Where the light is reflected against multiple substances, bouncing in so many directions.
This is different to the reflection of a plane mirror because wherever the light is reflected from the mirror, it bounces away from the surface in the same angle in which it came.

Question 17

What are the two types of waves?

Answer 17

Transverse and compression

Question 18

The angle of incidence is the same as?

Answer 18

The angle of reflection

Question 19

Define iris

Answer 19

A thin circular structure in the eye

Responsible for controlling the diameter of the pupil, controlling the amount of light reaching the retina

Question 20

Define cornea

Answer 20

• The cornea shields the rest of the eye from dust, germs etc.
• Controls the amount of oncoming light
• focuses 65-75%

Question 21

Define pupil

Answer 21

The pupil controls the amount of light entering the eye

Question 22

Define Lens

Answer 22

• Located behind the pupil

- provides fine tuning of focusing for reading the image

Question 23

Define Optic nerve

Answer 23

Carries images from the retina the brain

Question 24

Define Retina

Answer 24

Fine nerve tissue that transmits images to the brain

Question 25

Light waves

Answer 25

• TRANSVERSE waves
• unable to travel through some substances but can travel through vacuum.
• speed in air 300 000 000m/s

Question 26

Sound waves

Answer 26

• COMPRESSION waves
• travel through all liquids, solids, gases but not vacuum
• speed in air between about 330m/s and 350m/s depending on departure