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Optics Review

Total questions: 89

Worksheet time: 2hrs 8mins

Name
Class
Date
1.
The line that passes through the center of a curved mirror is called
a)
focal point
b)
center of curvature 
c)
principle axis
d)
light ray
2.
The focal length is equal to the:
a)
radius of curvature
b)
diameter of curvature
c)
half radius of curvature
d)
half diameter of curvature
3.
All rays that are parallel to the principle axis in a concave mirror reflects 
a)
Towards the focal point
b)
Away from the focal point
c)
Towards the center of curvature
d)
Away from the center of curvature
4.
In a concave mirror, if an incident ray passes through F and hits the mirror then it will reflect
a)

Towards Center of curvature

b)

Towards Focal point

c)

Parallel to the principle axis

d)
Away from the mirror
5.
According to the Law of reflection, a light ray striking a mirror
a)
continues moving through the mirror in the same direction
b)
moves into the mirror at a slightly different angle
c)
bounces off the mirror toward the direction it came from
d)
bounces off the mirror at the same angle it hits.
6.
What type of image does this lens form?
a)
Virtual image
b)
Real Image
c)
No Image
7.
Compared to the object in front the lens, its image is.....
a)
inverted and smaller
b)
inverted and larger
c)
not inverted and smaller
d)
not inverted and larger
8.

Concave lenses, like the ones found on many people's front door, always produce images that are .....

a)
Virtual, upright, smaller
b)
Real, inverted, larger
c)
Real, inverted, smaller
d)
Virtual, upright, larger
9.
In the formula m = hi/ho, the variable "m" refers to ___.
a)
the height of the image
b)
the height of the object
c)
the focal point
d)
how reduced or enlarged the image is compared to the object
10.

A 25.0 m object is placed 30.0 m from a convex lens, which has a focal length of 5.0 m. What is the distance of the image?

a)

6 m

b)

7 m

c)

8 m

d)

9 m

11.
Speed of light in a vacuum is
a)
represented by the symbol "c"
b)
3.00 X108 m/s 
c)
both answers are correct
12.
What is the index of refraction of a refractive liquid if the angle of incidence in the air is 35 degrees and the angle of refraction is 14 degrees?
a)
1.33
b)
2.21
c)
2.37
d)
1.72
13.

Which figure represents the path light takes through a converging lens?

a)
b)
c)
d)
14.

Critical angle and refractive index are:

a)

Directly related

b)

Equal

c)

Inversely related

d)

None of these

15.

For total internal reflection (incident light is past the critical angle), which of the following is correct?

a)

Light travels from rarer to denser medium.

b)

Light travels from denser to rarer medium.

c)

Light travels in air only.

d)

Light travels in water only.

16.

The optical density of turpentine is higher than that of water while its mass density is lower. Figure shows a layer of turpentine floating over water in a container. For which one of the four rays incident on turpentine in figure the path shown is correct?

a)

1

b)

2

c)

3

d)

4

17.

The optical density of turpentine is higher than that of water while its mass density is lower. Figure shows a layer of turpentine floating over water in a container. For which one of the four rays incident on turpentine in figure the path shown is correct?

a)

1

b)

2

c)

3

d)

4

18.

which type of lens

a)

opaque

b)

convex

c)

concave

d)

plano

19.

which type of lens

a)

concave

b)

convex

c)

opaque

d)

plano

20.

this is an example of

a)

refraction

b)

diffraction

c)

infraction

d)

reflection

21.

what type of mirror is this

a)

concave

b)

convex

c)

translucent

d)

plano

22.

what type of mirror is this

a)

concave

b)

convex

c)

translucent

d)

plano

23.

a convex mirror does what to rays

a)

diverges

b)

converges

c)

implodes

d)

merges

24.
The point in the middle way between a curved mirror and the center of curvature is the
a)
principle point
b)
focal point
c)
center of curvature
d)
principle axis
25.

Which of the following are the characteristics of the image formed in a plane mirror?

a)

Virtual and upright

b)

Virtual and inverted

c)

Real and inverted

d)

Real and upright

26.

The angle of incidence for an equilateral prism is 600. What should be the refractive index of prism so that the ray is parallel to the base inside the prism?

a)

1.414

b)

1.732

c)

1.33

d)

9/8

27.

A concave lens forms the image of an object such that the distance between the object and image is 10 cm and the magnification produced is 1/4. The focal length of the lens will be : __________

a)

8.6 cm

b)

6.2 cm

c)

10 cm

d)

4.4 cm

28.

When a ray of light enters a glass slab from air

a)

its wavelength decreases

b)

its wavelength increases

c)

its frequency increases

d)

neither its wavelength nor its frequency changes.

29.

Which ray diagram shows a real image?

a)
b)
c)
d)

None of the above

30.

Four ray diagrams show the images formed in mirrors and lenses. Which shows a virtual image?

a)
b)
c)
d)
e)

All of the above.

31.
What type of image is formed in a plane mirror?
a)
Real
b)
Virtual
c)
Enlarged
d)
Small
32.

What happens to the frequency of a wave as it passes through a gap？

a)

Increases

b)

Decreases

c)

No change

d)

None of above

33.

Two waves E and G are shown. The waves have the same speed.

Which statement is correct?

a)

Wave E has a greater amplitude than wave G.

b)

Wave E has a greater intensity than wave G.

c)

Wave E has a smaller frequency than wave G.

d)

Wave E has a smaller wavelength than wave G.

34.

The diagram shows a displacement-time graph for a progressive wave.

a)

Amplitude: 5 mm; Frequency: 40 Hz

b)

Amplitude: 5 mm; Frequency: 50 Hz

c)

Amplitude: 10 mm; Frequency: 40 Hz

d)

Amplitude: 10 mm; Frequency: 50 Hz

35.

Which observation indicates that sound waves are longitudinal?

a)

Sound can be reflected from a solid surface.

b)

Sound cannot be polarised.

c)

Sound is diffracted around corners.

d)

Sound is refracted as it passes from hot air to cold air.

36.

A diffraction grating is used to measure the wavelength of monochromatic light, as shown in the diagram.

The spacing of the slits in the grating is 1.00 x10-6 m. The angle between the first order diffraction maxima is 70.0o.

What is the wavelength of the light?

a)

287 nm

b)

470 nm

c)

574 nm

d)

940 nm

37.

Interference of light is evidence that:

a)

the speed of light is very large

b)

light is a transverse wave

c)

light is electromagnetic in character

d)

light is a wave phenomenon

38.

In a Young's double-slit experiment the centre of a bright fringe occurs wherever waves from the slits differ in the distance they travel by a multiple of:

a)

quarter of a wavelength.

b)

half a wavelength.

c)

a wavelength.

d)

three-fourths of a wavelength.

39.

In a Young's double-slit experiment, the slit separation is doubled. To maintain the same fringe spacing on the screen, the screen-to-slit distance D must be changed to:

a)

D/2

b)

D 2\sqrt{2}

c)

2D

d)

4D

40.

Two waves that have a phase difference 180°, pi, or half wavelength between each other will have a final interference of amplitude

a)

one.

b)

zero.

c)

same as the single wave.

d)

doubles the single wave.

41.

Extra distance travelled by one of waves compared with other is called

a)

path.

b)

displacement.

c)

phase difference.

d)

path difference.

42.

When a light wave enters into a medium of different optical density,

a)

its speed and frequency change.

b)

its speed and wavelength change.

c)

its frequency and wavelength change.

d)

its speed, frequency, and wavelength change.

43.

Light of wavelength 575 nm falls on a double-slit and the third order bright fringe is seen at an angle of 6.5o. What is the separation between the double slits?

a)

5.0 micro-m

b)

10 micro-m

c)

15 micro-m

d)

20 micro-m

44.

One beam of coherent light travels path P1 in arriving at point Q and another coherent beam travels path P2 in arriving at the same point. If these two beams are to interfere destructively, the path difference P1 - P2 must be equal to

a)

an odd number of half-wavelengths.

b)

zero.

c)

a whole number of wavelengths.

d)

a whole number of half-wavelengths.

45.
When the crest of one wave passes through the trough of another wave, ______ takes place.
a)
resonance
b)
diffraction
c)
destructive interference
d)
constructive interference
46.
In ________ interference, the energy of the combined wave is greater than the energy of each of the two waves.
a)
destructive
b)
rarefaction
c)
resonance
d)
constructive
47.
What color has the shortest wavelength, or the highest frequency?
a)
yellow
b)
blue
c)
red
d)
violet
48.

Laser is a monochromatic source of light- they have only one color. This means all the light waves have...

a)

same frequency

b)

same phase shift

c)

same intensity (amplitude)

d)

same direction of velocity

49.

Diagram shows a water wave propagating through a small gap.

What happen to the speed of diffracted wave?

a)

Increase

b)

Decrease

c)

Unchanged

50.

The diagram shows a series of wave fronts approaching an opening in a barrier. Point P is located on the opposite side of the barrier. The wave fronts reach point P as a result of

a)

resonance

b)

refraction

c)

reflection

d)

diffraction

51.

Which diagram best represents the shape and direction of a series of wave fronts after they have passed through a small opening in a barrier?

a)
b)
c)
d)
52.
What is interference of waves?
a)
A superposition of two waves to form a resultant wave with higher or lower frequency.
b)
A superposition of two waves to form a wave of larger or smaller amplitude.
c)
A superposition of two waves to form a resultant wave with higher or lower velocity.
d)
A superposition of two waves to form a resultant wave with longer or shorter wavelength.
53.
Standing waves are formed --
a)
by the superposition of two or more waves moving in opposite directions.
b)
by the superposition of two or more waves moving in the same direction.
c)
by the superposition of two or more waves moving in perpendicular directions.
d)
by the superposition of two or more waves moving in any arbitrary directions.
54.
The following is an example of which type of interference? 
a)
constructive 
b)
destructive 
55.
The following is an example of which type of interference? 
a)
constructive 
b)
destructive 
56.
What property of this wave is represented by the letter "A"
a)
amplitude
b)
crest
c)
trough
d)
wavelength
57.
What property of the wave is represented by the letter "B"?
a)
amplitude
b)
crest
c)
trough
d)
wavelength
58.
Which wave in the diagram has the greatest frequency?
a)
1
b)
2
c)
3
d)
4
59.

The image depicts which of the following wave behaviors?

a)

Resonance

b)

Doppler Effect

c)

Polarization

d)

Diffraction

60.

The two blue and purple waves will undergo _________________ when they meet.

a)

Constructive interference

b)

Destructive interference

61.
Velocity= ________
Wavelength= .5m
Frequency= 150 hertz
a)
.75 m/s
b)
75 m/s
c)
300 m/s
62.

The EM spectrum travels as what type of wave?

a)

Transverse

b)

Longitudinal

c)

Sound

d)

S-Waves

63.

What part of a wave is represented by letter F?

a)

Trough

b)

Crest

c)

Amplitude

d)

Wavelength

64.

Figure 2 shows three experiments for studying the interaction of monochromatic light with thin films of glass of various thickness t. The eye represents the position of the observer. The observer sees constructive interference in

a)

I only

b)

II only

c)

III only

d)

I and III only

e)

II and III only

65.

Colours are often observed when gasoline is poured onto water. This effect is primarily produced by

a)

diffraction

b)

diffuse reflection

c)

interference

d)

absorption

e)

incandescence

66.

A thin coating, of refractive index 1.2, is applied to a glass camera lens, of refractive index n > 1.2, to minimize the intensity of the light reflected. The wavelength of the light is . The coating thickness required to minimize the intensity of reflected light is

a)

λ2\frac{\lambda}{2}  

b)

λ2×1.2\frac{\lambda}{2\times1.2}  

c)

1.2λ4\frac{1.2\lambda}{4}  

d)

λ4×1.2\frac{\lambda}{4\times1.2}  

67.

The index of refraction of the thin film (water) is higher than air as shown in Figure above - the reflected ray will undergo a phase change of ½λ ( or π rad).

a)

True

b)

False

68.

If the index of refraction of the film is higher than air - the reflected ray will undergo a phase shift.

a)

TRUE

b)

FALSE

69.

Everytime light hits a "thin film" - there is a phase shift.

a)

TRUE

b)

FALSE

70.

What is the phase difference between the reflected and refracted rays if they (assuming n_surfaceB > n_film > n_air)?

a)

the thickness of the film (t)

b)

2t

c)

t + half of a wavelength

d)

2t + half a wavelength

71.

At the first air-soap interface (assuming soap has a higher index of refraction) there will be a phase shift.

a)

TRUE

b)

FALSE

72.

At the bottom soap-air interface ( soap film has a higher index of refraction n > 1) there will be a phase change for ray 2.

a)

TRUE

b)

FALSE

73.

What is the path difference of the reflected rays traveling through the film?

a)

t

b)

2nt

c)

t/2

d)

0

74.

Given the index of refractive for oil and water is 1.40 and 1.33 respectively. Both of the reflected rays act as inphase coherent source.

a)

TRUE

b)

FALSE

75.

The index of refraction of the thin film (water) is higher than air as shown in Figure above - the reflected ray will undergo a phase change of ½λ ( or π rad).

a)

TRUE

b)

FALSE

76.
Which wave is pictured?
a)
Transverse
b)
Longitudinal
c)
Both
d)
Neither
77.
Sound is an example of which type of wave?
a)
Transverse
b)
Longitudinal
c)
Both
d)
Neither
78.
What kind of wave is pictured below?
a)
compressional wave
b)
transverse wave
c)
sound wave
d)
mechanical wave
79.

This open end tube is in the

a)

1st harmonic

b)

2nd harmonic

c)

3rd harmonic

d)

4th harmonic

80.

How many wavelengths are there on a string (two fixed ends) vibrating at its fundamental frequency?

a)
1/4
b)
1/2
c)
1
d)
2
81.

How many wavelengths are there on a string (one fixed end, one free end) vibrating at its fundamental frequency?

a)
1/4
b)
1/2
c)
1
d)
2
82.

The pictured tube is 1.2 meters long. What is the wavelength of the wave inside?

a)

.6 m

b)

1.2 m

c)

1.6 m

83.

What is the frequency of the pictured wave on a string if the speed of the string wave is 1000 m/s and the length of the string is .75 meters?

a)

1,667 Hz

b)

3,333 Hz

c)

1133 Hz

d)

340 Hz

84.

The speed of sound is ________ on a cold day versus a hotter one.

a)

slower

b)

faster

c)

same speed

d)

depends on other factors

85.

When the frequency of a wave on a string increases, what happens to the wavelength?

a)

The wavelength is not directly affected by the frequency of a wave.

b)

The wavelength increases.

c)

The wavelength decreases.

d)

More specific information is needed to form a conclusion about the wavelength.

86.

You stand on the sidewalk next to the street. A fire truck is moving towards you. The frequency of the siren on the fire truck is 600 Hz.


What should you hear?

a)

Frequency higher than 600 Hz

b)

Frequency lower than 600 Hz

c)

Exactly 600 Hz

d)

No sound, silence.

87.

You stand on the sidewalk next to the street. A fire truck is away from you. The frequency of the siren on the fire truck is 600 Hz.


What should you hear?

a)

Frequency higher than 600 Hz

b)

Frequency lower than 600 Hz

c)

Exactly 600 Hz

d)

No sound, silence.

88.
The moving black dot is called:
a)
a node
b)
an anti-node
c)
an anti-amplitude
d)

None of these answers

89.

Even numbered harmonics do not form in a pipe with one end closed because

a)

the pipe “fits” only an odd number of quarter wavelengths

b)

the pipe “fits” only an even number of quarter wavelengths

c)

the pipe cannot put an anti-node at the open end

d)

the pipe cannot get enough air to vibrate in the pipe at these lengths

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