Optics

Question 1

what is the propagation speed for light

Answer 1

c=3x10^8

Question 2

what is the refractory index for air

Answer 2

1

Question 3

law of reflection is what

Answer 3

light bounce off
e.g. mirror
angle in is equal to angle out

Question 4

law of refraction what is it

Answer 4

object looks broken
e.g. pencil in a water of glass

Question 5

in the law of refraction what is the equation

Answer 5

n1sin(theta1) = n2sin (theta2)

Question 6

what is the equation for total internal reflection

Answer 6

theta = sin^-1 (n2/n1)

Question 7

if a lense is converging what sign will this be

Answer 7

positive

Question 8

if a mirror is concave what sign will it be

Answer 8

negative

Question 9

what is the mirror/ thin lense equation

Answer 9

1/image distance + 1/object distance = 1/focal length

Question 10

if magnification smaller than 1 this means that the image is

Answer 10

smaller than the object

Question 11

if magnification bigger than 1 what does this mean to the image

Answer 11

image is larger than the object

Question 12

object larger than the wavelength of light - what characteristics and what what optics

Answer 12

ray characteristics
geometric optics

Question 13

objects smaller than wavelength - what characteristics and what optics

Answer 13

wave characteristics
wave optics

Question 14

the behaviour of light in a medium is dictated by the mediums

Answer 14

refractive index

Question 15

why is the speed of light through its matter is less than its vaccum

Answer 15

atoms and particles in material interact with light - therefore hindering speed

Question 16

if the incident angle is greater than the critical angel then where are all light rays reflected

Answer 16

internally

Question 17

when then refractive index in medium one is higher than medium 2 what will occur

Answer 17

total internal reflection

Question 18

if a lense has a convering effect what lense is this

Answer 18

convex

Question 19

point of convergence and point of divergence of light rays passing through lens or reflecting off a mirror is called what and labelled what

Answer 19

focal point
F

Question 20

distance of focal point to lens is called what and labelled as what

Answer 20

focal length
f

Question 21

greater effect a lens has on light rays more what

Answer 21

optical power

Question 22

real or virtual - when light rays pass through image point

Answer 22

real

Question 23

real or virtual - when light rays DON”T pass through image point - light rays appear to come from image point of the same side as object

Answer 23

virtual

Question 24

can virtual object be presented on to a screen

Answer 24

no

Question 25

a concave lens can form what type of image

Answer 25

virtual only

Question 26

negative m revers to inverted/ upright image

Answer 26

inverted

Question 27

what is the process: image distance from the lens to retina (di) is fixed so the lens must adjust its focal length to focus images on the retina for objects at different distances

Answer 27

accomodation

Question 28

the distance to the closest object that can be seen clearly is called what

Answer 28

near point

Question 29

the distance to the closest object that can be seen clearly is called what

Answer 29

near point

Question 30

are the light rays from near objects not parallel what does this mean for what type of lens would be

Answer 30

true - lens must be more converging

Question 31

what muscle makes the lens thicker to be more converging and thinner to be less conversing

Answer 31

ciliary muscle

Question 32

equation for power is

Answer 32

P = 1/f

Question 33

what is the normal near point for a 25 year old

Answer 33

25cm

Question 34

what eye defect has shortsightedness - inability to see far objects clearly - far point

Answer 34

myopia

Question 35

what eye defect has the - inability to see close objects clearly - near point further away from normal

Answer 35

hypermetropia

Question 36

what eye defect has this near point gets further away - not a disease - normal part of ageing

Answer 36

presbyopia

Question 37

what eye defect is this - entire image not completely in focus, but parts are - corrected by wearing glasses

Answer 37

astigmatism

Question 38

bending of wave around edged of an opening

Answer 38

defraction

Question 39

what is it called when two waves cross each other

Answer 39

interference

Question 40

in phase - are when peaks and troughs are in line what will this mean for resultant wave what type of interference is this called

Answer 40

twice amplitude - constructive interference

Question 41

out phase is when peaks and troughs dont align what will the resultant amilitude be - what type of interference is this

Answer 41

resultant is zero destructive

Question 42

the smaller the aperture the _____ the angle of diffraction

Answer 42

larger

Question 43

the limit to the ability of any optical instrument to produce distinct images of objects which are very close together is called what

Answer 43

resolving power or resolution

Question 44

glasses with convering or diverging lenses are able to correct hypermetropia

Answer 44

converging

Question 45

is it possible for a converging lens to form a virtual image -

Answer 45

no because this means that it would be a convex lens to be converding only concave lens (diverging) and convex mirrors are able to produce virtual image

Question 46

is it possible for a diverging lens to form a real image

Answer 46

no because only concave (diverging) lens are able to produce virtual

Question 47

what is the formular for refractive index

Answer 47

n=c/v (c is a constant)

Question 48

a convex lense when do>F what does this mean for an image

Answer 48

real, enlarged, inverted

Question 49

a convex lens do

Answer 49

Alway virtual, enlarge and upright

Question 50

in concave lens image will be

Answer 50

alway virtual, reduced and upright

Question 51

in convex mirror image will be

Answer 51

virtual, always reduced and up right

Question 52

in concave mirror (do>F) image will be

Answer 52

image real, enlarged and inverted

Question 53

in a concave mirror (do<) image will be

Answer 53

always virtual, enlarged and up right