Worksheets123f124ct10n
Total questions: 71
Worksheet time: 55mins
Light travels through a liquid at 2.25 x 108 m/s. What is the index of the liquid?
flint glass n=1.70
barium glass n=1.60
crown glass n=1.523
water n=1.33
diamond n=2.45
What letter is used to represent refractive index?
c
n
v
θ
What letter is used to represent the speed of light?
c
n
v
θ
What is a line drawn at 90° to a surface called?
incident ray
normal line
refracted ray
tangent
A beam of light strikes a glass block with refractive index of 1.52, at an angle of 5°, what is the angle of refraction?
7.51
0.087
0.13
3.29
What is the angle of incidence on a glass block with refractive index 1.52 if the angle of refraction is 32°?
52.6
20.7
32.0
74.3
What is the refractive index of air?
1.5
1.2
0.5
1.0
Which of the following is true about a wave that has been refracted?
The speed and frequency changes, but the wavelength stays the same.
The speed and wavelength changes, but the frequency stays the same.
The wavelength and frequency changes, but the speed stays the same.
The speed and frequency changes, but the amplitude stays the same.
What is the speed of light in water of refractive index 1.33?
3.0×108m/s
2.0×108m/s
2.3×108m/s
3.9×108m/s
Which of the following is true?
When light travels from a vacuum into glass it speeds up.
When light travels from a vacuum into glass it bends away from the normal.
When light travels from a vacuum into glass the frequency decreases.
When light travels from a vacuum into glass the wavelength decreases.
Which of the following is a correct representation of snell's law?
n1sinθ2=n2sinθ1
n1sinθ1=n2sinθ2
n2sinθ1=n1sinθ2
n1/sinθ1=n2/sinθ2
Based on the image, which medium has a larger index of refraction?
Medium 1 has a larger index of refraction.
Medium 2 has a larger index of refraction.
Both mediums have the same index of refraction.
Cannot be determined.
Based on the image, as light passes from medium 1 to medium 2
light speeds up and bends towards the normal
light speeds up and bends away from the normal
light slows down and bends towards the normal
light slows down and bends away from the normal
When light passes at an angle to the normal from one medium into another in which its speed is lower
it is bent towards the normal.
it always lies along the normal.
it is unaffected.
it is bent away from the normal.
If all other variables are held constant, what happens to the angle of refraction if the angle of incidence increases?
the angle of refraction stays the same
the angle of refraction decreases
the angle of refraction increases
cannot be determined from the information provided
The diagram shows a ray of light going from medium A into medium B. Which one of the following statements cannot be correct?
A is air and B is glass.
A is water and B is vacuum.
A is water and B is air.
A is glass and B is vacuum.
A ray of light is shone on a rectangular glass block as shown. Identify A, B and C.
A = Refracted ray, B = Incident ray, C = Normal
A = Incident ray, B = Refracted ray, C = Normal
A = Normal, B = Refracted ray, C = Incident ray
A = Refracted ray, B = Angle of incidence, C = Angle of refraction
The diagram shows a ray of light AB striking the interface of medium X and medium Y. BC is the refracted ray. Which one of the following statements is correct?
Medium X is optically less dense than Y and ray BC travels faster than AB.
Medium X is optically denser than Y and ray BC travels slower than AB.
Medium X is optically denser than Y and ray BC travels faster than AB.
Medium X is optically less dense than Y and ray BC travels slower than AB.
The principal behind optical fibres is
total internal reflection
total external reflection
total internal refraction
diffraction
When a ray of light enters from one medium to another , its velocity is doubled. The critical angle for the ray for total internal reflection will be
30o
60o
90o
incomplete information
Light has the highest speed in which medium?
flint glass =1.70
barium glass =1.60
crown glass =1.523
water =1.33
Why is the orange angle less than the red angle?
air has a higher index than water
water has a higher index than air
it is just random
more info is needed
Based on this diagram, the speed of light is faster in...
air
water
the speed of light is the same in both materials
Light travels at 2×108 m/s in a certain plastic. What's the index of refraction in that material?
1.00
1.50
0.66
6.00
Light goes from air to water (n = 1.33) at an angle of 35 degrees. What's the angle of refraction?
14.2 degrees
25.5 degrees
35 degrees
90 degrees
Which of the following would result in TIR?
Air to water
Glass to air
n = 1.0 to n = 1.33
n = 1.0 to n = 1.51
Why are there two normal lines in this picture?
The light ray changes medium twice
The light ray is undergoing TIR
there is an error
In what medium does light move the slowest?
a
b
c
light moves at the same speed in all 3
Dispersion occurs because of
Refraction
Reflection
Diffraction
What does the law of refraction state?
The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant called the refractive index.
The ratio of the sine of the angle of refraction to the sine of the angle of incidence is a constant called the refractive index.
The ratio of the sine of the angle of incidence to the sine of the angle of reflection is a constant called the refractive index.
The normal ray, reflected ray and incident ray all lie in the same plane.
Light travels from air into a "mystery" material. The incident ray of light hits the surface at angle of 43o and the refracted ray enters the mystery material at an angle of 27o. What is the index of refraction of the mystery material?
1.5
1.0
0.67
2.1
Light travels from air into a glass block that has an index of refraction of 1.46. The incident ray of light hits the surface at angle of 45o. At what angle will the light ray enter the glass?
45o
29o
31o
64o
A polarizer is used to:
reduce intensity of light
produce polarized light
increase intensity of light
produce unpolarized light
light waves can be polarized as they are:
transverse
of high frequency
longitudinal
reflected
Approximately how much light is blocked by two polarizing filters that are perpendicular to each other?
0%
50%
75%
100%
Approximately how much light is blocked by two polarizing filters that are parallel to each other?
0%
50%
75%
100%
Polarized light of intensity I0 is incident on a polarising filter. The angle between the plane of polarisation of the incident light and the transmission plane of the polariser is θ. Which graph shows how the intensity I of the light transmitted through the polariser varies with θ?
A
B
C
D
Unpolarised light of intensity I0 is incident on a polariser with a vertical transmission axis. The transmitted light is incident on a sheet of material X. After transmission through X the intensity of the light is I0/2.
It is suggested that X could be
I. a polarizer with vertical transmission axis
II. a polarizer with horizontal transmission axis
III. non polarizing glass.
Which of the above suggestions is/are correct?
I and III only
I only
II only
I and II only
Two polarizing filters are set up so the transmitted light is at a maximum intensity.
Through which angle should polariser 2 be rotated so that no light is transmitted?
45º
60º
90º
180º
•An initially unpolarized light of intensity Io is incident to a polarizer. The transmitted light then goes through an analyzer that makes a 30 angle with the axis of the initial polarizer. In terms of Io, what is the intensity of the light transmitted through the analyzer?
0 Io
0.33 Io
0.5 Io
0.375 Io
Polarized light travels to a polarizer whose transmission axis makes an angle of 25° . Calculate the fraction of incident light intensity that gets transmitted through the polarizer.
82%
41%
91%
18%
Light shines through a hole into a box and come out the other side with ~38% of the initial intensity. You know there are only two polarizers in the box. Which of the following is the closest angle difference between the two polarizers?
30°
90°
40°
45°
A filament lamp is a source of unpolarised light.
A polarising filter is placed between a filament lamp and an observer. The filter is rotated in the plane perpendicular to the direction of travel of the light.
Which of the following is observed as the filter is rotated through an angle of 90°?
The light intensity changes from maximum to minimum.
The light intensity changes from minimum to maximum.
The light intensity does not change.
The light intensity is zero throughout the rotation.
A ray of unpolarised light is incident on a polarising filter. The polarising filter transmits light of intensity I, as shown.
The polarising filter is then rotated in the direction shown on the diagram.
Which of the following gives the intensity of light transmitted after the filter has been rotated 90°?
0
4I
2I
I
Which of the following types of wave cannot be plane polarised?
light
microwaves
ultrasound
ultraviolet
Light from a lamp passes through two polarising filters, P1 and P2, before reaching a
detector. The filters initially have their planes of polarisation parallel.
The intensity of light at the detector will be greatest if
P1 is rotated by 45° and P2 is rotated by 315° in the same direction.
P1 is rotated by 90° and P2 is rotated by 270° in the same direction.
P1 is rotated by 45° and P2 is rotated by 270° in the same direction.
P1 is rotated by 90° and P2 is rotated by 315° in the same direction.
How much of light is blocked by this single polarizing filter?
0%
50%
75%
100%
Two polarizing filters are placed in front of a light source. If the axis of the two filters are perpendicular to each other, how much of the light is blocked by them?
0%
50%
75%
100%
Two polarizing filters are placed in front of a light source. If the axis of the two filters are perpendicular to each other, how much of the light is transmitted to the other side by them?
0%
50%
75%
100%
