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Chapter 23:Physical optics

Total questions: 54

Worksheet time: 54mins

Name
Class
Date
1.
The combination of two or more waves that result in a single wave
a)
A. diffraction
b)
B. resonance
c)
C. reflection
d)
D. interference
2.
When a wave bends around a barrier or passes through an opening, it is called
a)
Diffraction
b)
Reflection
c)
Refraction
d)
Interference
3.

To demonstrate the phenomenon of interference, we require two sources

a)

Of the same frequency and having a constant phase difference

b)

Of nearly the same frequency

c)

Of the same frequency

d)

Of different wavelengths

4.

For Young's double slit experiment, the fifth dark fringe is equivalent to:

a)

m=4 maximum

b)

m=5 maximum

c)

m=4 minimum

d)

m=5 minimum

5.

It is difficult to get clear Young's double slit fringes with white light because

a)

The frequency of white light is too high

b)

The wavelength of white light is too low

c)

the different colour fringes overlap

d)

white light is not bright enough

6.

'Every points on the wave front of light are the sources of smaller waves called wavelets.' This is the statement of

a)

Huygen

b)

Hubble

c)

Ronaldo

d)

Fazlina

7.

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)
8.

What type of interference is represented in this diagram?

a)

Constructive

b)

Destructive

9.

What type of interference is represented in the diagram?

a)

Constructive

b)

Destructive

10.
Which of the following will increase the spacing of Young's double slit fringes
a)
A blue light is used instead of a red light
b)
the screen is moved closer to the slits
c)
the slits are moved closer together
d)
Each slit is made wider
11.

Which of the following will decrease the spacing of Young's double slit fringes

a)

decreasing the wavelength of the waves

b)

moving the screen further away

c)

decreasing the distance between the slits

d)

Using narrower slits

12.

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

a)

path.

b)

displacement.

c)

phase difference.

d)

path difference.

13.

Two light sources are said to be coherent if they

a)

are of the same frequency.

b)

are of the same frequency, and maintain a constant phase difference.

c)

are of the same amplitude, and maintain a constant phase difference.

d)

are of the same frequency and amplitude.

14.
When two waves combine to form a new wave with a larger amplitude, it is called 
a)
Diffraction
b)
Destructive Interference
c)
Resonance
d)
Constructive Interference
15.
When two waves combine to form a new wave with a smaller amplitude, it is called 
a)
Refraction
b)
Constructive Interference
c)
Resonance
d)
Destructive Interference
16.

For Young's double slit experiment, the fifth bright fringe is equivalent to:

a)

m=4 maximum

b)

m=4 minimum

c)

m=5 maximum

d)

m=5 minimum

17.

Which of the following figures represent is a double

slit interference pattern?

a)

A

b)

B

c)

C

d)

D

18.

The top bright fringe order is?

a)

Fourth order minimum

b)

Third order minimum

c)

Fourth order maximum

d)

Third order maximum

19.

If the distance of the slit separation is doubled, the fringe width is:

a)

halved

b)

doubled

c)

no change

20.

For Young's double slit interference distance of nthn^{th} dark fringe from the center of the screen is  

a)

 nλDd\frac{n\lambda D}{d}  

b)

 nλdD\frac{n\lambda d}{D}  

c)

 (n+12) λDd\left(n+\frac{1}{2}\right)\ \frac{\lambda D}{d}  

d)

 (n+12) λdD\left(n+\frac{1}{2}\right)\ \frac{\lambda d}{D}  

21.

For diffraction at a single Slit, the angular position for nth minimum is

a)

θ=nλ\theta=n\lambda

b)

θ= nλa\theta=\ \frac{n\lambda}{a}

c)

θ= (n+12)λa\theta=\ \left(n+\frac{1}{2}\right)\frac{\lambda}{a}

d)

θ= naλ\theta=\ \frac{na}{\lambda}

22.

Which of the following statements is untrue when applied to Young's double slit pattern

a)

The fringes are equally spaced

b)

A bright fringe occurs when the waves arrive in phase

c)

The sources must be coherent

d)

The centre fringe is the brightest

23.

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

a)

t

b)

2nt

c)

t/2

d)

0

24.

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 π rad

a)

True

b)

False

25.

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

26.

What is the condition for the constructive interference of the thin film shown in figure above?

a)

2t = mλ where m = 0,1,2,3,...

b)

2nt = mλ where m = 0,1,2,3,...

c)

2t = (m+½)λ where m = 0,1,2,3...

d)

2nt = (m+½)λ where m = 0,1,2,3...

27.

What is the condition for destructive interference to occur for the soap film shown?

a)

2nt = mλ

b)

2nt = (m+¼)λ

c)

2nt = (m+½)λ

d)

2nt = (m+¾)λ

28.

Every time light hits a "thin film" - there is a phase change occurs for the reflected ray.

a)

False

b)

True

29.

According to huygen's principle,light is a form of

a)

particle

b)

rays

c)

wave

d)

none of the above

30.

A slit of width a is used to observe a diffraction pattern on a screen at a distance L from the slit.If the width of the slit were doubled, the width of the central bright band would

a)

decrease by a factor of 4

b)

decrease by a factor of 2

c)

increase by a factor of 2

d)

increase by a factor of 4

31.

In a single slit diffraction experiment the width of the slit is reduced . What happens to the width of the central bright fringe in the resulting diffraction pattern

a)

Stays the same

b)

It becomes narrower

c)

it becomes wider

d)

the central bright fringe disappears

32.

What is the formula used to find the separation between 2 adjacent line on a diffraction grating?

a)

nλcos⁡ θ\frac{n\lambda}{\cos\ \theta}

b)

nλsin⁡ θ\frac{n\lambda}{\sin\ \theta}

c)

nλtan⁡ θ\frac{n\lambda}{\tan\ \theta}

d)

(n+12)λsin⁡ θ\frac{\left(n+\frac{1}{2}\right)\lambda}{\sin\ \theta}

33.

Which of the following figures represent is a single slit diffraction pattern?

a)

A

b)

B

c)

C

d)

D

34.

These two waves are _________.

a)

monochromatic and in phase

b)

monochromatic and out of phase

c)

multichromatic and in phase

d)

multichromatic and out of phase

35.

A slide with three diffraction gratings on it is used for an experiment. Which has the largest value of slit spacing, d?

a)

50 lines per mm

b)

100 lines per mm

c)

200 lines per mm

36.

A student holds a laser and diffraction grating such that they are projecting a series of bright and dark fringes onto the whiteboard. As the student walks toward the board, the bright spots ______.

a)

become closer together

b)

moves farther apart

c)

maintain the same spacing

37.

Which of the following describes Huygens Principle?

a)

Every point on a wavefront acts as a source of lots of secondary spherical wavelets, which can therefore interfere with each other.

b)

A wave can produce an interference pattern.

c)

The angle of incidence is equal to the angle of reflection.

d)

The speed of light is constant in every direction.

38.

The distance between two consecutive wavefronts is called

a)

Time period

b)

Frequency

c)

Wavelength

d)

Displacement

39.

Two coherent light must have equal value in the following quantities EXCEPT their

a)

Phase difference

b)

Phase

c)

Wavelength

d)

Frequency

40.

How does a bright fringe form from interference?

a)

When a light beam has a path difference equal to one wavelength

b)

When a light beam has a path difference equal to half wavelength

c)

When a light beam has the same amplitudes

d)

When a light beam has a path difference with odd integer multiple of it

41.

Two sinusoidal wave with the same wavelength and amplitude is traveling in the same direction and have a phase difference of a quarter of a cycle. What will happen if the two waves are superimposed?

a)

A wave with same wavelength but a larger amplitude will be produced.

b)

No wave is produced because of complete destructive interference.

c)

A wave with a longer wavelength but same amplitude will be produced

d)

A wave with same wavelength but a smaller amplitude will be produced.

42.

What is the characteristic of to coherent light waves?

a)

same phase

b)

Constant phase difference

c)

Almost the same amplitude

d)

Constructive disturbances.

43.

Phase difference of 180° is equivalent to path difference of

a)

2λ

b)

λ

c)

λ/2

d)

λ/4

44.

In Young’s double slit experiment, the distance between two adjacent bright fringes, ∆𝑦 is

a)

2λDd\frac{2λD}{d}

b)

3λDd\frac{3λD}{d}

c)

λDd\frac{λD}{d}

d)

λdD\frac{λd}{D}

45.

FIGURE shows two interference patterns, P and Q produced by illuminating two slits using two different coherent light sources. Which of the interference patterns is being produced by a light source with a longer wavelength?

a)

P

b)

Q

46.

A colorful pattern is observed in a sop bubble. This phenomenon is caused by

a)

Diffraction of light

b)

Diffraction and refraction of light

c)

Diffraction and reflection of light

d)

Reflection and interference of light

47.

At the bottom soap-air interface (soap film has a higher index of refraction n > 1) , Is there any phase change upon reflection for ray 1 and 2?

a)

No phase change for Ray 1 ; 𝝅 phase change for Ray 2

b)

𝝅 phase change for Ray 1 ; no phase change for Ray 2

c)

no phase change for both rays

d)

𝝅 phase change for both rays

48.

Given the index of refractive for oil and water is 1.40 and 1.33 respectively for thin film shown in figure. Both of the reflected rays act as ............................ coherent source.

a)

Inphase

b)

Antiphase

49.

Using cross pair method, identify what is the condition for missing in reflected rays to occur for the soap film shown?

a)

2nt = m𝝀

b)

2nt = (m+½) 𝝀

c)

nt = m𝝀

d)

nt = (m+½) 𝝀

50.

Bending of light around the edges of an obstacle is known as:

a)

Refraction

b)

Polarization

c)

Diffraction

d)

Interference

51.

All of the following conditions can increased the width of central bright obtained in a single slit diffraction EXCEPT

a)

Change purple light to red light

b)

increase the width of the slit

c)

put the screen farther from the slit

d)

decrease the width of the slit

52.

Which of the following statement regarding single slit diffraction is FALSE ?

a)

Between each pair of dark fringes there is a bright fringe due to constructive interference.

b)

The higher order bright fringes are much less intense.

c)

All waves interfere destructively creates a dark central fringe on the screen directly opposite the slit.

d)

3rd minimum dark fringe is corresponding to order number n = 3

53.

Number of bright dots can be seen for light passing through a diffraction grating depends on all of the following EXCEPT

a)

Grating spacing

b)

Wavelength of light used

c)

Number of lines of a grating

d)

Angle of incident

54.

In grating experiment, if white light is used

a)

Alternate dark and bright fringes will be seen

b)

Colored fringes will be seen on either side of central bright fringe

c)

A series of bright fringes will be seen

d)

nothing happens

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