Refraction and Lens Lecture

Question 1

the incident ray, refracted ray, and the normal ray at the point of incidence all lie in the same plane

Answer 1

laws of refractio

Question 2

states that the ratio of the sines of the angles of incidence and refraction is equivalent to the phase velocities in two media or equivalent to the reciprocal of the ratio of the indices of refraction

Answer 2

snell’s law

Question 3

the ratio of the sines of the angles of incidence and refraction is equivalent to what

Answer 3

phase velocities of two media
reciprocal of the ratio of indices of refrection

Question 4

mathematically, for an angle of incidence θ1 and the angle of refraction θ:

Answer 4

sin θ1 / sin θ2 = v1 / v2 = n2/n1

Question 5

bending of light as it goes from one optical medium to another

Answer 5

refraction

Question 6

when the light rays travels from air to water, the refracted ray bends towards the ___

Answer 6

normal

Question 7

is the ratio of the velocity of light in a
vacuum (3 x 108 m/s) to the velocity through the material.

Answer 7

index refraction

Question 8

velocity of light in a vacuum

Answer 8

3x10^8 m/s

Question 9

why is n>1

Answer 9

the index of refraction will always be greater than 1 since light will have a slower speed in a medium other than a vacuum

Question 10

index of refraction formula

Answer 10

n = c/v

Question 11

• The rays of light from a stone get bent (refracted) as they leave the water.

Answer 11

real and apparent depth

Question 12

is actual distance of an object beneath the surface, as would be measured
by submerging a perfect ruler along with it.

Answer 12

real depth

Question 13

in a medium is the depth of an object in a denser medium as seen
from the rarer medium. Its value is smaller than the real depth.

Answer 13

apparent depth

Question 14

a medium in which the speed of light is less.

Answer 14

optically denser

Question 15

– a medium in which the speed of light is more

Answer 15

optical rarer

Question 16

As the index of refraction value increases, the optical density ____

Answer 16

increases

Question 17

As the index of refraction value increases, the optical density increases, and
the speed of light in that material ___

Answer 17

decreases

Question 18

is the bending of light (also happens with sound, water, and other waves) as it passes from one transparent substance into another

Answer 18

refraction

Question 19

this bending by ___ makes it possible for us to have lenses, magnifying glasses, prisms, and rainbows

Answer 19

refraction

Question 20

speed of light in a vacuum

Answer 20

3.00x10^8

Question 21

when light travels to a material it travels at a ___ speed

Answer 21

different

Question 22

ratio of the speed of light (c) in a vacuum to the speed of light in a medium (v)

Answer 22

index of refraction

Question 23

index of refraction formula

Answer 23

n = c/v

Question 24

c in index of refraction is

Answer 24

speed of light in vacuum

Question 25

v in n =c/v is the

Answer 25

speed of light in the midum

Question 26

index of refraction in terms of wavelength

Answer 26

N = λ/λm λ - wavelength in a vacuum λm = wavelength in a medium

Question 27

although the speed changes and the wavelength changes in refraction the ___ will be constant

Answer 27

frequency

Question 28

formula of frequency wavelength and speed

Answer 28

V = fλ

Question 29

the relationship between the angles of incidence and refraction and the indices of refraction of the two media

Answer 29

snell's law

Question 30

lens that is thicker in the center than the edges

Answer 30

convex lenses

Question 31

lens that converges (brings together) light rays

Answer 31

convex lenses

Question 32

forms real images and virtual images depending on the position of the object

Answer 32

convex lenses

Question 33

lenses that are thicker at the edges and thinner at the center

Answer 33

concave lenses

Question 34

lens that diverges light rays

Answer 34

concave lenses

Question 35

convex lenses images are

Answer 35

real and virtual depending on position

Question 36

concave lenses images are

Answer 36

erect and reduced

Question 37

common vision defects

Answer 37

farsightedness nearsightedness astigmatism

Question 38

insufficient refractive power to focus rays on retine

Answer 38

farsightedness

Question 39

excess refractive power focuses rays before they lead in retina

Answer 39

nearsightedness

Question 40

focuses light in different planes at different points

Answer 40

asymmetric refraction

Question 41

the ability to see objects clearly which are near but objects far away are blurred

Answer 41

nearsightedness

Question 42

nearsightedness is also known as

Answer 42

myopia

Question 43

caused by the fact that rays of light focus in front of the retina of the eye

Answer 43

nearsightedness

Question 44

nearsightedness is caused by the fact that the rays of light focus in ___ of the retina of the eye

Answer 44

front

Question 45

correcrted using a diverging lens

Answer 45

myopia

Question 46

ability to see objects clearly which are far but objects close to the eye appear blurred

Answer 46

farsightedness

Question 47

farsightedness is also known as

Answer 47

hyeropria

Question 48

caused by the fact that rays of light focus behind the retina of the eyeco

Answer 48

farsightedness

Question 49

hyeropia is corrected by using __

Answer 49

converging lens

Question 50

nearsightedness - fixed with ___ lens farsightendness - fixed with ___ lens

Answer 50

diverging converging

Question 51

to correct nearsightedness, a person will wear ___ glasses

Answer 51

concave

Question 52

to correct farsightedness a person will wear ___ glasses

Answer 52

convex

Question 53

which of the following can cause refraction of light rectangular glass block prism concave lenses all of this

Answer 53

all of this

Question 54

what is the nature of image formed in a concave lens always real always virtual real or virtual none of these

Answer 54

always virtual, always diminished, upright

Question 55

properties of image formed by concave lens

Answer 55

virtual upright diminished

Question 56

when light is incident along the principal axis of a convex lens, where does the refracted ray go?

Answer 56

along the principal axis

Question 57

what is the correct formula for snell's law sin i = sin r sin i / sin r = constant sin i > sin r i/r = constant

Answer 57

sin i / sin r = constant

Question 58

which of the following can cause dry leaves to burn when sunlight falls on it for a long time

Answer 58

convex

Question 59

a fish in a lake is looking at a tree on the edge of the lake how does the tree appear to the fish shorter same size taller none of these

Answer 59

taller

Question 60

what happens when light goes from R to D (denser)

Answer 60

bends toward the normal

Question 61

the refractive index of water, fused quartz, benzene, and ruby are 1.33, 1.46, 1.50, and 1.70 respectively in which material does light travel the slowest?

Answer 61

ruby

Question 62

if the focal length of a concave lens is 2.5m, what is the power of the lens? 0.5 D -0.5D -0.4D 0.4D P = 1/f in m = 100/f in cm

Answer 62

-0.4 D

Question 63

concave lens has positive/negative pwoer

Answer 63

negative

Question 64

convex lens has positive/negative power

Answer 64

positive