Light & Optical Systems

Question 1

What is the ray model of light

Answer 1

Light travels straight in all dirrections from its source
Light does not bend around objects

Question 2

What happens to light when it hits these surfaces
Opaque
Transparent
Translucent

Answer 2

Opaque: Bounces off
Transparent: goes through
Translucent: Some bounce off, some pass through, and some changes dirrection

Question 3

Describe concave and convex

Answer 3

Concave curves inward and convex curves outward

Question 4

What do images appear with convex and concave

Answer 4

Convex is bigger images
Concave is smaller

Question 5

What is the law of reflection

Answer 5

Angle of incidence= angle of reflection

Question 6

Why do rough surfaces produce a non definite image

Answer 6

light bounces off in lots of different dirrection

Question 7

explain far-sightedness

Answer 7

image is focused behind the retina

Question 8

explain near-sightedness

Answer 8

image is focused infront of retina

Question 9

Which part of the eye is like these camera parts and why.
The film
The diaphragm
the aperture
the lens

Answer 9

The film = Retina They convert light into electrical signals
The diaphragm = iris They both contract and retract to control the amount of passing light
The aperture = pupil They are both holes than enlarge or shrink to change the ammount of light that gets in
The lens = the lens they both bend and focus on light to produce a clear image

Question 10

Why do eyes have blind spot

Answer 10

There are no photosensitive cells where the optic nerve and retina connect