Optics

Question 1

light is both a ….. and a …..

Answer 1

wave, particle.

Question 2

what happens when the waves amplify each other?

Answer 2

they are constructive and create the light bands we see.

Question 3

what are waves?

Answer 3

a disturbance that transfers energy from one point to another without transferring matter.

Question 4

what is a medium?

Answer 4

any physical disturbance that acts as a carrier for the transmission of energy

Question 5

what is radiation?

Answer 5

a method of energy transfer that does not require a medium

Question 6

what is the order of electromagnetic radiation?

Answer 6

(longest to shortest)
R radio
M microwaves
I infrared
V visible
U ultraviolet
X x-ray
G gamma rays

Question 7

show how the eye-brain sees the image of the object:

Answer 7

draw the diagram

Question 8

what are the 2 parts that make up a mirror?

Answer 8

a sheet of glass and reflective silver/aluminum

Question 9

what is the purpose of each part of the mirror?

Answer 9

the reflective part is shiny film on the back and the glass protects the film and helps make the mirror look better

Question 10

what does ‘normal’ mean?

Answer 10

the line to the mirror’s surface

Question 11

what does ‘angle of incidence’ mean?

Answer 11

angle between ray of incident and normal ray

Question 12

what does ‘angle of reflection’ mean?

Answer 12

angle between ray that reflected and normal ray

Question 13

state the 2 laws of reflection:

Answer 13

1. angle of incidence equals the angle of reflection

2. incident ray and normal lie in the same spot (co-plannar)

Question 14

what’s the difference between specular reflection and diffuse reflection?

Answer 14

specular - reflection of light off a smooth, shiny surface

diffuse - reflection of light off an irregular or dull surface

Question 15

what is an incident ray?

Answer 15

(incoming ray) the ray which meets the mirror at the point of incident

Question 16

what is a reflected ray?

Answer 16

the ray which reflects off the mirror from the point of incidence

Question 17

what are the 4 SALT characteristics of an image in a plane mirror?

Answer 17

S - size (larger, same, smaller)
A - attitude/inversion (upright, inverted)
L - location (same distance between the mirror)
T - type (virtual, real)

Question 18

concave is also known as:

Answer 18

diverging mirror

- causes parallel light rays to come to a point

Question 19

convex is also known as:

Answer 19

converging mirror

Question 20

do snells law word problems:

Answer 20

:)

Question 21

the critical angle is the angle of incidence when what happens?

Answer 21

when the refracted angle is 90º

Question 22

what is the critical angle of glass?

Answer 22

41º

Question 23

what is the critical angle of diamond?

Answer 23

24º

Question 24

label the parts of the eye:

Answer 24

• iris
• pupil
• cornea
• lens
• retina
• optic nerve

Question 25

what is hyperopia?

Answer 25

far-sightedness

• can see far but not close
• light focuses past/behind the retina
• to fix, convex/converging lens is needed

Question 26

what is myopia?

Answer 26

short-sightedness

• can see close but not far
• light focuses in front of the retina
• to fix, concave/diverging lens is needed

Question 27

lens equations table

Answer 27

…