Optics

Front 1

two thin lenses focal length 10 sm sep by 4 cm
equic power?

Back 1

16 D

Front 2

what is the critical angle

Back 2

incident ray where refracted ray is 90 deg

Front 3

light normally incident on transparent medium with n = 1.5, what is the %transmittance

Back 3

r = [(1.5-1)/(1.5-1)^2] x 100% = 4%

Front 4

focal length for biconves lens with r = 50sm and n = 1.5

Back 4

50 cm

Front 5

lens 50 cm from light souece, image is shart at 16.6 cm from the lens, power = ?

Back 5

+8

Front 6

fish is 2 m below surface viewed from directly above what is the actual depth of this fish
n = 1.33

Back 6

2.66m

Front 7

n = 1.732 from air. what percent in reflected

Back 7

7.1% fresnel

Front 8

if light enters a different refractive index, what changes

Back 8

velocity and wavelenth

Front 9

focal length of positive thin les is obj dist is 90cm and im dist is 45 cm

Back 9

0.3m

Front 10

3 lenses with focal length 10cm, 20cm, and -40cm are places in contact--focal length of combo?

Back 10

8cm

Front 11

light incient on water n = 1.33 - plastic interface
99.7% transmitted
index of plastic?

Back 11

fresnel formula
1.48

Front 12

telecope
ocular focal lenth is 10 cm
distance between obj and oc is 2.1m
angular mag?

Back 12

-20x

Front 13

for thick lens, the two nodal pts and 2 principal points coincide only if n1 and n2 of the media in front and behind the lens are

Back 13

equal

Front 14

myopic patient
horizontal and vertical bars both blurry
vertical bars clearer
what type of astig?

Back 14

wtr

Front 15

thin prism deviates light 8cm at dist of 4m prism dipters?

Back 15

2

Front 16

5x gallilean telescope lesnses sep by 10cm
powers of obj and oc?

Back 16

+8, -40

Front 17

shortes dist between real obj and real im for thin lens

Back 17

4f

Front 18

when a lens surface is bent, the principal planes will move in which direction

Back 18

toward the side with more bending

Front 19

costringence is associated with

Back 19

chromatic aberration

Front 20

by what factor will sph ab increase if entrance pupil is changes from 3,, to 6mm

Back 20

4 (prop to sq)

Front 21

what happens to focal lengths if a mirror is submerges in water

Back 21

stay the same

Front 22

6PD prism, n = 1.523
what is the apical angle

Back 22

6.5

Front 23

total internal reflection

Back 23

when index of medium the light is traveling in is greater than the index of the medium the light is traveling into

Front 24

a ray emerges from second surface of parallel sided plate im unkown medium
what is the n of the first surface of the plate?

Back 24

incident angle is equal to the emergent angle
see snell's law

Front 25

a ray strikes an interface and is refracted at a larger angle than the incident

1. what is the change in velocity
2. is the n of the second medium higher or lower than the first
3.is the wavelength shorter or longer before refraction
4. how is the frequency affected

Back 25

1. velocity is greater after refraction
2. lower (higher to lower n, light bends away from normal)
3.shorter
4. stays the same

Front 26

wavelenght = 460nm,
n = 1.24, enters this from air
new wavelength = ?

Back 26

371nm

Front 27

an image of an object 50cm from -10D lens will be
real or virtual
mini or mag
erect of inverted

Back 27

virtual
mini
erect

Front 28

schematic eye
r of cornea = 5.50mm
length = 24mm
n = 1.33
what distance will the eye see clearly?

Back 28

-21.8cm

Front 29

real obj in water is 33.33cm from convex SSRI with r = 21.25mm. emergent medium has n = 1.50
where is the image, is it real or virtual

Back 29

39cm, real

Front 30

real obj and its real image formed by a curved mirror lie in the same plane 40 cm from mirror
power of mirror?

Back 30

+5

Front 31

symmetrical planes

Back 31

conjugate planes
positive unit magnification
image is always inverted

Front 32

equiv power of biconvex lens, 25mm thick, n = 2.0, radii = 100 mm and 50mm
obj space n = 1.0
im space n = 1.5

Back 32

+1.25

Front 33

+4.00 and +7.00 thin lenses in contact
real obj 40 cm in front
image characterisitics?

Back 33

real, inverted, mag = 1/3

Front 34

viewing from the retina, the exit pupil of the eye is

Back 34

image of iris formed by the lens

Front 35

eye with SSRI = +60, n = 133
constringence of water = 55.6
what is the chromatic aberration?

Back 35

1.08D
CA = P/v
= +60/55.6

Front 36

euler's constant

Back 36

when you measure the diptric power along any two perpendicular meridians of a toric lens, the sum is always 2S + C of the lens = Eulers constant

Front 37

compund microscop is +50 lens spe by 15cm in front of +100 lens
mag = ?

Back 37

-150x

Front 38

is longitudinal sph ab constant for a given lens

Back 38

no, changes depending which meniscus is in front

Front 39

how is coma related to aperture size

Back 39

proprotional to square of ap size

Front 40

orthoscopic lens systems eliminate

Back 40

distortion

Front 41

where will suns rays focus if they pass through globe of water n = 1.33 diamter = 6 inches 1 inch = 2.54cm

Back 41

9 inches from sph center

Front 42

where are the two principal planes for a planoconvex thick lens?

Back 42

one at the vertex, the second inside the lens in front of the planar surface

Front 43

real obj is 50cm in front of thin lens
virtual erect image is formed, and is 1/3 the size of the object
lens power = ?

Back 43

-4.00D

Front 44

expected snellen VA with PH of 1.5mmdiamters
assume wavelenght = 550nm

Back 44

2/30
rayleigh criterion

Front 45

AR coating on a spectacle, thickness = 100, whjat is the index?

Back 45

1.38

Front 46

convert from lumens to watts

Back 46

lumen = 685lumens/watts (luminous efficiency)

Front 47

if wave one has amp of 4, and wave 2 has amp of 2, what is the relative instensiry of the 2nd compared to the 1st

Back 47

1/4
for harmonic wave, intensity is proportional to amplitude squared

Front 48

presence of colors in oil slicks is due to

Back 48

thin-film intereference

Front 49

laser aimed 10,000km away initially 20mm diam, how large with the diam be when it hits the target

Back 49

421 mm

r = 1.22(wavelength)d/D
r = 1.22(690x10^-0)(10,000x10^3m)/20x10^3
r = 421
diameter = 2r = 842m

Front 50

in a double slit experient the fringes are

Back 50

of equal width and proportional to the wavelength and the screen distance

fringe width = wavelenthd/D

Front 51

a telecsopt has + obj and oc, what type is it

Back 51

keplerian

Front 52

a telescope has obj +10.00 and oc +50.00. what is the d distance of the telescoe?

Back 52

12 cm
d = f1 + f2

Front 53

a telescope has obj +10.00 and oc +50.00. what is the mag

Back 53

-5

Front 54

a telescope has obj +10.00 and oc +50.00. where is the exit pupil relative to the eyepiece

Back 54

+2.40 cm

Front 55

a telescope has obj +10.00 and oc +50.00. what is the size of the exit pupil

Back 55

-1.00 cm

Front 56

a telescope has obj +10.00 and oc +50.00.
if the obj is 25 cm in front, what lens is necessary in front of the objective to create a compound microscope

Back 56

+4.00

Front 57

a telescope has obj +10.00 and oc +50.00.
if tube length can be changes, what 'g' distnace is needed to create a compound microscipe with a real object located at 25cm in front of objective

Back 57

6.67cm

Front 58

telecsopt with +20 and -40. what is the d distance

Back 58

2.50 cm

Front 59

telecsopt with +20 and -40.
mag?

Back 59

+2.0x

Front 60

telecsopt with +20 and -40.
where is the exit pupil

Back 60

1.25cm from eyepiece

Front 61

telecsopt with +20 and -40.
size of exit pupil

Back 61

2cm

Front 62

telecsopt with +20 and -40.
if obj is 50cm in front of the object lens what trial lens would be necessary ?

Back 62

+2.00

Front 63

telecsopt with +20 and -40. obj at 50cm, how would you need to change tube length

Back 63

0.56cm

Front 64

oens clock has pin sep of 1.0cm
lens clock n = 1.53
how far will the central pin move for +1.00D lens made from glass with n = 1.53

Back 64

0.094mm

Front 65

lens clock gives front surface sag of 4.23, back surface sag of 1.23. n = 1.53. what is the nominal power of the lens? lens is 70.00 mm round and lens clock is calibrated for 1.53

Back 65

+2.45

Front 66

lesn clocked has front suraface of +7.00 and back surface of -3.00, edge thickness = 2.2mm.
what is the center thickness
lesn is 50mm round, made from poly
lens cal for 1.53

Back 66

4.56nm

Front 67

n poly

Back 67

1.586

Front 68

clock calibrated for n = 1.53 ued on cr-39. front suraface measres +5.00 and back is -7.50D
what is the adjusted nominal power

Back 68

-2.34D

Front 69

find sag of CL with BC of 7.5mm and chord diameter of 8.0mm

Back 69

1.16mm

Front 70

which lens material has highest specific gravity

Back 70

crown glass

Front 71

bv power = +4.00
lens n = 1.50
front surface power = +10.00
center thickness = 2.2mm
back surface power = ?

Back 71

-6.20D

Front 72

les is 50mmround
bv power is +4
lens is CR 39 (n = 1.5)
front suraface = +10.00
CT = 3.4mm
lens is for OD
prism if pt looks 4.0mm nasal to OC

Back 72

1.6 BO

Front 73

frame is 52x18
PD = 62mm
decentration?

Back 73

4mm in

Front 74

bv power = -4.00
55.0 mm round
front surface is +2.00
n = 1.60
CT = 2.2mm
minimum edge thickness?

Back 74

4.73mm

Front 75

back vertex = -4.00 -1.00 x 180
front surface is +2.00
n = 1.6
CT = 2.2mm
minimal ET?

Back 75

4.73mm

Front 76

roudn CL
n = 1.45
back vertex power = -5.00
BC = 7.85mm
CT = 0.14mm
K's: 42.50@180 and 44.00 @90
front surface power = ?

Back 76

+52.05D

Front 77

CL with back vert power of -5.00, BC is 7.85mm, Ks are 42.50@180 and 44@90
spec rx at 13mm?

Back 77

-4.77 -1.50 x 180

Front 78

prims is 3 PD BDn
lens is 50.0mm round
ET of lens alone is 2.4mm
total ET at the base of the prism?
n = 1.50

Back 78

5.4mm

Front 79

60mm round lens with power of +6.00 D
OC is moved 4mm down from geometrical center, find ET difference between the apex and base of the prism that is created
n = 1.50

Back 79

2.88mm

Front 80

what is thicker--prism by grinding to prism by decentration

Back 80

neither

Front 81

+5.00 -4.00 x 120
power in 180th meridian

Back 81

+2.00

Front 82

what aberration can be controlled via steeper base curve

Back 82

radial astigmatism

Front 83

front surface is +5 back surface is -2.00, n = 1.523 (crown glass) and CT is 3mm
back vertex power?
front vertex power?

Back 83

+3.05D
+3.01D

Front 84

spec les has front surface pwoer of +5.00, back surface is -2.00, lens n = 1.523 and CT is 3.0mm
BVD is 14.00mm, distance from cornea to entrace pupil is 6.0mm
shape magnification?
pwer mag?
total mag?

Back 84

1.02x
0.94x
0.96x

Front 85

what happens to mag is BC is flatter, but bd is the same

Back 85

shape mag decreases

Front 86

find far point for:
+4.00 lens
distnace from lens to center fo rot of eye is 27mm

Back 86

-223mm

Front 87

what happens to curv of field abberation if BC is flattened

Back 87

will increase

Front 88

what lenses produce barrel distortion

Back 88

high minus

Front 89

spec lens with power of +8.00 worn 16.0 mm from nodal pt of eye
what is spectacle mag? assume lens is thin

Back 89

+14.68%

Front 90

spec lesn is -8.00 16mm from nodal pt
spec mag?

Back 90

-11.35%

Front 91

+4.00 OD
-6.00 OS
15mm from nodal pt
% difference in mage between the two eyes, assum lenses are thin

Back 91

14.64%

Front 92

height of snellen leter that subjtend 5 min arc at 6 m test distance

Back 92

8.73mm

Front 93

shcmatic eye
0.5mm thick cornea
n = 1.376
surface pwoers are =48.83 and -5.82
aqueous n = 1.336
how far from seocnd surface of cornea will a distance object be images?

Back 93

30.5mm

Front 94

a reduced eye with SSRI of r=6mm as cornea
n = 1.333
ap stop is 4mm
axial length is 25.13mm
a ray with slope x is heading toward the cetner of curvature the ray will refract at what angle
size of exit pupil?
refractive error?

Back 94

x
4.0mm
2.5 D myopic

Front 95

reduced eye, r cornea is 5.5mm
n - 1.36
far pt is 200nm in front of conea
what is the distance from the second nodal point tothe retina?

Back 95

17mm

Front 96

emmetropic eye
n - 1.336
r cornea is 5.7mm
disntace from corean to retina is 22.9mm
distant obj sutends 2 deg
how large is the retianl image?

Back 96

0.59mm
uses tan fnc

Front 97

eye with n = 1.336
SHA
power in hor meird is 58D
vert power is 57D
distant obj
how far from corean will horizontal line image be foremed

Back 97

23.4mm

Front 98

of gullstrands 4 refracting surfaces, which has the least refracting power

Back 98

posterior cornea

Front 99

angle alpha

Back 99

between visual and optic axes

Front 100

cause of blue arcs of the retina

Back 100

action currents passing through the papillomacular bundle

Front 101

entopic phenomenon seen in bright blue monochromatic light (430nm)

Back 101

capillary ciruclation

Front 102

phosphenes

Back 102

visual sensations that result from stimuli other than light

Front 103

are the following on or off axis aberrations
spherical
astigmatist
petzval
disortion

Back 103

on, rest are off

Front 104

retinal image has sptial sine wave pattern with max intens of 10lumens/m^2 and min intesnity of 2 lumens/m^2
contrast = ?

Back 104

0.67

Front 105

sine wave pattern with max intens of 16, min intens of 4. straiy light of 2.5 intenisty falls on retinal image..how is contrast affected

Back 105

-0.12

Front 106

which aberrations blur the retinal image

Back 106

coma
sp aberration
radial astigmatism

Front 107

which abberrations DEFORM the image

Back 107

curve of field
distortion

Front 108

OD +2.00
OS -8.00

what changes in OS can decrease diff in spec mag?

Back 108

inc thickness
inc front surface power
move lens closer to cornea
dec n

spec mag is greater OD, so want to INCREASE it OS

Front 109

axial length 21.5mm
n = 1.333
power of eye = 61.75
if viewing near target at 25cm what is acc stim?

Back 109

+4.25 D

Front 110

aphake has axial length 22.8mm
n = 1.333
ks are 44.50 @75 and 42.75 @ 165
which CL corrects this eye

Back 110

+15.75 -1.75 x 165

Front 111

43.50 @ 85 and 47.00 @175
how mcuh astig do you expect on ret?

Back 111

javals rule
4.87 ATR

Front 112

aphake has corneal power 42.50, acial length 24mm
n = 1.333
power of IOL should be?

Back 112

+21.50

Front 113

lenticular theory of presbyopia

Back 113

due to changes in lens capsule

Front 114

sm sournce 4 feet above 8ft diameter round tavle produces illum of 8lumsn/cm^2 at center of table
what is the illumination at the edge?

Back 114

2

Front 115

what wavelenghts are most efficiently transmitted to the human retina

Back 115

visible and IRA

Front 116

image of distant diffusing light sournce has retinal illum of 11.75 lumens/cm^2 with 2.5mmdiamter pupil. what will the illuminace be is the pupil dilates to 4.0mm?

Back 116

30.1

Front 117

entire visible spectrum range

Back 117

380 to 760nm

Front 118

what type of light is radiated from a tungsten halogen light source

Back 118

long wavelenth

Front 119

accomdation latency in response to change in target vergence

Back 119

360ms

Front 120

which color test is best for acquired deects

Back 120

F-M 100hue
best for BY defects

Front 121

does a deuteronalomous pt require more red or more green

Back 121

more green

Front 122

for v small central fields, pt will appear to be

Back 122

tritanopic--no short wavelenth cones in central fovea

Front 123

most common color deficiency

Back 123

deuteranomaly

Front 124

difference berwen rods and cone photopig is due to

Back 124

opsin

Front 125

sptial summation size corresponds to

Back 125

retinal ganglion cell RF size