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Topic 8 Physical Optics

Total questions: 48

Worksheet time: 57mins

Name
Class
Date
1.

The lines which joins all the adjacent points which have the same phase in a wave is called

a)

wavelet

b)

fringe

c)

wave front

d)

None of these

2.

Distance between 2 adjacent wavefront represent

a)

wavelength

b)

speed

c)

intensity

d)

slit separation

3.

Wave front always ______________ to the direction of ray propagation.

a)

tangent

b)

perpendicular

c)

parallel

d)

none of above

4.

Huygen's Principle can be used to construct wavefronts in the following cases EXCEPT

a)

Resolution

b)

Reflection

c)

Refraction

d)

Diffraction

5.

Which of the following statement is TRUE concerning two monochromatic light waves that are coherent?

a)

The have same phase

b)

They have same frequency and constant phase difference

c)

The have almost the same amplitude

d)

They have constructive disturbance.

6.

Position of new wave front of all secondary wavelets for other is ?

a)

Parallel

b)

Normal

c)

Tangent

d)

Any of these

7.

Path difference  λ2\frac{\lambda}{2}   correspond to phase difference of

a)

 2π2\pi  

b)

 π\pi  

c)

 π2\frac{\pi}{2}  

d)

 π4\frac{\pi}{4}  

8.

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

a)

quarter-integral number of wavelengths

b)

zero

c)

an integral number of wavelengths

d)

half-integral number of wavelengths

9.

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

10.

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)
11.

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

a)

path.

b)

displacement.

c)

phase difference.

d)

path difference.

12.

"Each point on the wavefront emits a semicircular wavelet that moves a distance s=vt. The new wavefront is a line tangent to the wavelets. " This is the statement of

a)

Newton

b)

Planck

c)

Huygen

d)

Young

13.

Huygen’s concept of secondary wave

a)

allows us to find the focal length of a thick lens

b)

is a geometrical method to find a wavefront

c)

is used to determine the velocity of light

d)

is used to explain polarisation

14.

Which of the following is related to Huygen's Principle?

a)

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

b)

Wavelets can interfere with each other, but only before the waves go through a slit.

c)

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

d)

The speed of light is constant in every medium.

15.

According to Huygens’ principle, light is a form of

a)

particle

b)

wave

c)

rays

d)

radiation

16.

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.

17.

For a sustained interference pattern in double slits, which of the following conditions must be fulfilled? You can choose more than one answer)

a)

sources of same frequency and having a constant phase difference

b)

nearly the same amplitudes

c)

of the same intensities for both sources

d)

small distance between the slits (<λ)

e)

same wavelength ( monochromatic)

18.
What is meant by monochromatic light?
a)
A light source with one wavelength only
b)
A light source with one speed only
c)
A light source with only white light
d)
A light source that is coherent
19.
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
20.
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
21.

Which of the following figures represent is a double

slit interference pattern?

a)

A

b)

B

c)

C

d)

D

22.

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

a)

 mλDd\frac{m\lambda D}{d}  

b)

 mλdD\frac{m\lambda d}{D}  

c)

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

d)

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

23.

In Young’s double slit experiment, if the monochromatic source of yellow light is replaced by red light in which λyellow < λed , the fringe width

a)

increases

b)

decreases

c)

remains unchanged.

d)

the fringes disappear

24.

In a Young's double slit experiment, green light is incident on the two slits. The interference pattern is observed on a screen. Which one of the following changes would cause the fringes to be more closely spaced?

a)

Reduce the slit separation distance

b)

Use red light instead of green light

c)

Use blue light instead of green light

d)

Move the screen farther away from the slits

25.

Which of the following is TRUE about slit separation, d the distance D from slits to the screen and the separation of fringes in a double slits experiment ?

a)

Separation of fringes increases as D increases.

b)

Separation of fringes increases as D decreases.

c)

Separation of fringes increases as d increases.

d)

Separation of fringes decreases as d decreases.

26.

When a soap bubble is incident with sunlight, a colorful pattern is formed on the surface of the bubble. This phenomenon is caused by


I Reflection

II Refraction

III Interference

IV Diffraction

a)

I & IV

b)

I & III

c)

II & III

d)

II & IV

27.

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

a)

TRUE

b)

FALSE

28.

A 180o (½λ) phase change occurs when light reflects from a medium of higher refractive index.

a)

TRUE

b)

FALSE

29.

When light travels through a material with a smaller refractive index toward a material with a larger refractive index (e.g., air to gasoline), reflected ray undergoes π rad phase change that is equivalent to

a)

λ4\frac{\lambda}{4}

b)

λ2\frac{\lambda}{2}

c)

λ\lambda

d)

2λ2\lambda

30.

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

31.

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

32.

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

a)

t

b)

2nt

c)

t/2

d)

0

33.

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

34.

When light suffers reflection at the interface between oil ( n= 1.42) and glass (n = 1.56), the change of phase in the reflected wave is

a)

zero

b)

π\pi

c)

π2\frac{\pi}{2}

d)

2π2\pi

35.

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...

36.

What is the condition in order for the reflected rays in the soap film shown strongly reflected?

a)

2nt = mλ

b)

2nt = (m+¼)λ

c)

2nt = (m+½)λ

d)

2nt = (m+¾)λ

37.

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

a)

Refraction

b)

Polarization

c)

Diffraction

d)

Interference

38.

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

39.

A narrow slit is illuminated and a diffraction pattern is obtained on a screen. If the width of the slit is decreased, what happen to the width of the central maximum ?

a)

increases

b)

Decreases

c)

Remain unchanged

d)

None of above

40.

Which picture is diffraction?

a)
b)
c)
d)
41.

When compact disk is illuminated by a source of white light, coloured lines are observed. This is due to

a)

dispersion

b)

diffraction

c)

interference

d)

refraction

42.

What is the equation used to determine the maximum order that can be observed on screen ?

a)

n>dλn>\frac{d}{\lambda}

b)

n<1Nλn<\frac{1}{N\lambda}

c)

n<λdn<\frac{\lambda}{d}

d)

n<Nλn<N\lambda

43.

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

44.

Red light (630 nm) is passed through a diffraction grating

with 300 lines per cm and a series of bright spots are

observed on a screen. Which of the

following would decrease the numbers of order can be obtained on the screen?


I. Replacing the red light with light of shorter wavelength.

II. Moving the screen closer to the

grating

III Replacing the grating with a grating having

600 lines per cm

a)

I only

b)

II only

c)

III only

d)

I and II only

45.

For the grating shown, which grating produces greater number of bright spots (maxima) on screen ?

a)

100 lines / mm

b)

300 lines / mm

c)

600 lines / mm

46.

The path difference between these two waves is ________.

a)

0 waves

b)

1 wave

c)

2 waves

d)

3 waves

47.

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

48.
A red light of wavelength 650 nm is used with a diffraction grating with 500 lines per mm.
How many diffraction maxima will be seen in total
a)
1
b)
3
c)
5
d)
7

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