Quiz 9

Question 1

index of refraction symbol

Answer 1

n

Question 2

a smaller θ = _____ index of refraction

Answer 2

larger

Question 3

n1 = air
n2 = water
water is thicker than air, so the θ in the water is _____ than the θ in the air

Answer 3

less

Question 4

if θ1 < θ2, then…

Answer 4

there is a refracted beam

Question 5

if θ1 = θ2, then…

Answer 5

total internal reflection, θ=90

Question 6

if θ1 > θ2, then…

Answer 6

no refracted beam

Question 7

c =

Answer 7

critical angle

Question 8

for a diverging lens, (f=-40cm) find the image distance for an object 22.0cm from the lens. determine the magnification

Answer 8

Question 9

how fast is light traveling in the liquid if x=4.80cm?

Answer 9

Question 10

what is dispersion?

Answer 10

light going into another medium and color components are spread out (into component wavelengths)

Question 11

does index of refraction depend on wavelength

Answer 11

slightly

Question 12

a converging lens (f=+20cm) is 37cm in front of a screen. where should the object be placed?

Answer 12

Question 13

a converging lens is magnified by 4 with a screen placed 10cm from the lamp. where should the object be placed and what is its focal length?

Answer 13

Question 14

what is N

Answer 14

near point
shortest distance at which sharp images can be seen
generally 25cm

Question 15

what is far point?

Answer 15

farthest distance at which sharp images can be seen
generally infinite

Question 16

myopia is being near sighted.
this means the light is _____ and you need a _____ lens to correct it

Answer 16

overconverged
diverging

Question 17

hyperoxia means being far sighted. this means the light is _____ and you need a _____ lens to correct it

Answer 17

under converged
converging

Question 18

a student can only focus on objects between 80cm-50cm. what type of lens do they need?

Answer 18

bifocal

Question 19

when 2 waves superimpose, what determines constructive vs destructive interference?

Answer 19

phase relation - how the path difference relates to a wavelength

Question 20

for a constructive wave, ∆1=

Answer 20

mλ

Question 21

for a destructive wave, ∆1=

Answer 21

(m + 1/2)λ

Question 22

path difference is found by ∆1=

Answer 22

dsinθ

Question 23

linear distance from a certain fringe:

Answer 23

y=Ltanθ

Question 24

if small angle approximation applies, tanθ=

Answer 24

y/L

Question 25

if y increases then the slit is _____

Answer 25

wider

Question 26

if y decreases then m _____

Answer 26

increases?

Question 27

if y decreases then λ _____

Answer 27

decreases

Question 28

if y decreases then L _____

Answer 28

decreases

Question 29

if y decreases then d _____

Answer 29

increases

Question 30

red light (664nm in a vacuum) is used with the slits separated by 120µm. the screen is located 2.75m away.
what is θ

Answer 30

Question 31

when is there a phase change?

Answer 31

low high low
high low high

Question 32

the wave is _____ if the phase shift is low to high

Answer 32

flipped

Question 33

what are the 2 smallest thicknesses of silicon oxide that will give zero reflection for a wavelength of 550nm?
air n = 1
sio n = 1.45
si n = 3.5

Answer 33

Question 34

light of wavelength in a vacuum of 500nm is incident on a soap bubble. for what minimum thickness will this light be seen?
n = 1
n = 1.4
n = 1

Answer 34

Question 35

what is diffraction?

Answer 35

wave bending through an opening

Question 36

what is d and w

Answer 36

d = distance between multiple slits
w = width between singular slit