Free Printable wave optics

1.

what is the shape of the wavefront on earth for sunlight?

a)

spherical

b)

cylindrical

c)

plane

d)

none of these

2.

what is the shape of the wavefront on earth for sunlight?

a)

spherical

b)

cylindrical

c)

plane

d)

none of these

3.

what is the shape of the wavefront on earth for sunlight?

a)

spherical

b)

cylindrical

c)

plane

d)

none of these

4.

diffraction is waves bending because of

a)

edges of a slit or thin object

b)

speed of wave changes

c)

dark matter

d)

gravity

5.

You use a green laser (wavelength 532 nanometers) in order to measure the thickness of a hair. The formula for Diameter is lambda divided by the sine of theta. (but since theta is small we can use opposite over adjacent). x = 1.7 cm and d = 180 cm. What is the diameter (D)?

a)

56329 x10 -8 meters

b)

56329 x 10-9 meters

c)

56.329 microns

d)

56329 x10-7 meters

6.

The intensity of light for the interference of two light wave with a phase difference of $\phi$ is

a)

$I=4I_o\cos\frac{\phi}{2}$

b)

$I=4I_o\cos^2\ \frac{\phi}{2}$

c)

$I=4I_o\cos\phi$

d)

$I=4I_o^2\cos\phi$

7.

For Young's double slit interference distance of $n^{th}$ bright fringe from the center of the screen is

a)

$\frac{n\lambda D}{d}$

b)

$\frac{n\lambda d}{D}$

c)

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

d)

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

8.

The figure shows the diffraction pattern by a single slit which has a slit size of 0.017 mm and is placed 80 cm from the screen. The light used has a wavelength of 600 nm. what is the width of the central bright band?

a)

5.65 cm

b)

7.21 cm

c)

6.65 cm

d)

8.34 cm

9.

The figure shows a monochromatic light of wavelength $\lambda$ being incident onto a single slit. The slit size is a. What is the value of d in terms of $\lambda$ ?

a)

$\lambda$

b)

2 $\lambda$

c)

3 $\lambda$

d)

4 $\lambda$

10.

A wave front is an imaginary surface where

a)

all particles lying on this vibrate in opposite phase

b)

some particles in same phase and some in opposite phase

c)

all particles lying on this vibrate in same phase

d)

none of these

11.

consider the diffraction pattern for a small pinhole. as the size of hole is increased then the central bright _________

a)

the size decreases

b)

the size increases

c)

no change

d)

no effect

12.

consider the diffraction pattern for a small pinhole. as the size of hole is increased then the intensity of central bright _________

a)

no change

b)

decreases

c)

increases

d)

non of these

13.

draw the distance verses intensity graph in case of interference.

14.

what is the basic difference in refraction and diffraction ?

4 lines

15.

YOUNGS DOUBLE SLIT EXPERIMENT first performed in air and then in a medium other than air. it is found that 8 th bright fringe in the medium lies where 5 th dark fringe lies in air . find the value of refractive index of medium?

4 lines

16.

4 lines

17.

Diffraction of light is the

a)

Splitting of a white ray of light in seven colour rays

b)

Superposition of waves emitted from coherent sources

c)

Bending of light around the corners of a very thin aperature

d)

Bending of light when it travels from one medium to another medium

18.

Relation between phase difference and path difference is

a)

$x=\frac{2\pi}{\lambda}\phi$

b)

$x=\frac{\lambda}{2\pi}\phi$

c)

$x=\frac{\phi}{2\pi\lambda}$

d)

$x=\frac{2\pi\lambda}{\phi}$

19.

Condition for getting bright fringe in YDSE is

a)

$x=\frac{\left(2n+1\right)\lambda}{2}$

b)

$x=\frac{\left(2n-1\right)\lambda}{2}$

c)

$x=\left(n+1\right)\lambda$

d)

$x=n\lambda$

20.

The ratio of intensities of two light sources in YDSE is 4:1. The ratio of their amplitudes will be:

a)

4:1

b)

1:4

c)

16:1

d)

2:1

21.

In YDSE the separation between the slits and the distance between slits and screen both are halved. What will be effect on the interference pattern observed?

a)

No effect

b)

Fringe width will be doubled

c)

Fringe width will be 4 times

d)

Fringe width will be 1/4 times

22.

In diffraction pattern

a)

We get the fringes of same intensities

b)

We get all the fringed of same width

c)

We get the fringes of different intensities and different width

d)

We get fringes of same intensites but different width

23.

In interference pattern

a)

We get the fringes of same intensity and same width

b)

We get the fringes of same intensity but different width

c)

We get the fringes of different intensity but same width

d)

We get the fringes of different intensities and different widths

24.

For diffraction of light condition of getting secondary minima is

a)

$x=\frac{\left(2n+1\right)\lambda}{2}$

b)

$x=\left(2n+1\right)\lambda$

c)

$x=n\lambda$

d)

None of these

25.

The shape of wave front from a distant souce of light will be

a)

Spherical

b)

Plane

c)

Cylindrical

d)

Elliptical

26.

According to Huygens' principle:

a)

Each point on wavefront is a source of secondary wavelet

b)

Each wavelet is a source of new wavefront

c)

The speed of secondary wavelets is lesser than the speed of primary wavelets

d)

The new wavefront can be taken in forward as well as in backward direction.

27.

If a plane wavefront is incident on a concave mirror, then the emergent wavefront will be _________ of the mirror as its centre.

a)

conical with focus

b)

spherical with focus

c)

spherical with centre of the curvature of the surface

d)

conical with centre of the curvature of the surface

28.

The energy of the wave travels in a direction (a) to the wavefront.

29.

_______ principle says that each point of the wavefront is the source of a secondary disturbance and the wavelets emanating from these points spread out in all directions with the speed of the wave.

a)

Rayleigh

b)

Maxwell

c)

Huygens

d)

Hertz

30.

According to Huygens principle of secondary wavelets, each particle at a wave front

a)

is an electron

b)

behaves as a photon

c)

represents the direction of the motion of wave front

d)

behaves as a new light source

31.

The spherical wave front is received

a)

near the Sun

b)

near a lighting tube-light

c)

when the light wave is coming from Sun to Earth

d)

all of the above

32.

The direction of wave front of a wave with the difference of propagation of wave is

a)

parallel

b)

perpendicular

c)

opposite

d)

at angle

33.

A wave front is an imaginary surface where

a)

all particles lying on this vibrate in opposite phase

b)

some particles in same phase and some in opposite phase

c)

all particles lying on this vibrate in same phase

d)

none of these

34.

The phenomenon of diffraction can be understood using

a)

Fraunhofer

b)

Uncertainty principle

c)

Fresnel

d)

Huygens principle

35.

Wave front is a imaginary surface, where

a)

everywhere phase is equal

b)

phase difference are equal

c)

phase difference is different

d)

none of these

36.

A wavefront is defined as a surface of ________ phase.

a)

constant

b)

increasing

c)

decreasing

d)

time variable

37.

Two coherent sources of light can be obtained from

a)

Two different lamps

b)

Two different lamps but of the same colour

c)

Two different lamps of the same colour and having the same colour

d)

None of these

38.

Which of the following phenomenon is not explained by Huygen’s wave theory?

a)

Diffraction

b)

Interference

c)

Polarisation

d)

Photoelectric effect

39.

How does the diffraction band of blue light look in comparison with the red light?

a)

No changes

b)

Diffraction pattern becomes narrower

c)

Diffraction pattern becomes broader

d)

Diffraction pattern disappears

40.

What is path difference for destructive interference?

a)

(a) nλ

b)

(b) n(λ +1)

c)

(c) (2n + 1)λ/2

d)

(d) (n +1)λ/2

41.

Resolving power of microscope depends upon

a)

(a) wavelength of light used (directly proportional)

b)

b) wavelength of light used (inversely proportional)

c)

(c) frequency of light used

d)

d) focal length of objective

42.

If a plane wavefront is incident on a concave mirror, then the emergent wavefront will be _________ of the mirror as its centre.

a)

conical with focus

b)

spherical with focus

c)

spherical with centre of the curvature of the surface

d)

conical with centre of the curvature of the surface

43.

The energy of the wave travels in a direction _____________ to the wavefront.

a)

similarly

b)

oppositely

c)

perpendicularly

d)

none

44.

_______ principle says that each point of the wavefront is the source of a secondary disturbance and the wavelets emanating from these points spread out in all directions with the speed of the wave.

a)

Rayleigh

b)

Maxwell

c)

Huygens

d)

Hertz

45.

The spherical wave front is received

a)

near the Sun

b)

near a lighting tube-light

c)

when the light wave is coming from Sun to Earth

d)

all of the above

46.

A wave front is an imaginary surface where

a)

all particles lying on this vibrate in opposite phase

b)

some particles in same phase and some in opposite phase

c)

all particles lying on this vibrate in same phase

d)

none of these

47.

The phenomenon of diffraction can be understood using

a)

Fraunhofer

b)

Uncertainty principle

c)

Fresnel

d)

Huygens principle

48.

The shape of waverfront for a light emerging out of a convex lens when a point source is placed at its focus

a)

Plane wavefront

b)

Soherical wavefront

c)

cylindrical wavefront

d)

none

49.

The characteristics of wave which does not change after refraction is

a)

Wavelength

b)

Velocity

c)

Frequency

d)

none

50.

The disturbance that travelling through medium or vacuum from one place to other by transferring the energy. That sentence is definition for......

a)

Wave

b)

Vibration

c)

Medium

d)

Oscillation

51.

The intensity of light for the interference of two light wave with a phase difference of $\phi$ is

a)

$I=4I_o\cos\frac{\phi}{2}$

b)

$I=4I_o\cos^2\ \frac{\phi}{2}$

c)

$I=4I_o\cos\phi$

d)

$I=4I_o^2\cos\phi$

52.

For Young's double slit interference distance of $n^{th}$ bright fringe from the center of the screen is

a)

$\frac{n\lambda D}{d}$

b)

$\frac{n\lambda d}{D}$

c)

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

d)

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

53.

For Young's double slit interference the fringe width $\beta$ is_______-

a)

$\frac{\lambda D}{d}$

b)

$\frac{\lambda d}{D}$

c)

$\frac{D}{\lambda d}$

d)

$\frac{d}{\lambda D}$

54.

The ratio of intensity of Maxima and Minima for the in the interference of two waves with amplitude $a_1$ and $a_{2\ }$ is

a)

$\frac{\left(a_1+a_2\right)}{\left(a_1-a_2\right)}$

b)

$\frac{\left(a_1-a_2\right)}{\left(a_1+a_2\right)}$

c)

$\frac{\left(a_1+a_2\right)^2}{\left(a_1-a_2\right)^2}$

d)

$\frac{\left(a_1-a_2\right)^2}{\left(a_1+a_2\right)^2}$

55.

For diffraction at a single Slit, the angular position for n^th minimum is

a)

$\theta=n\lambda$

b)

$\theta=\ \frac{n\lambda}{a}$

c)

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

d)

$\theta=\ \frac{na}{\lambda}$

56.

For diffraction at a single Slit, the angular position for n^th secondary maxima is

a)

$\theta=n\lambda$

b)

$\theta=\ \frac{n\lambda}{a}$

c)

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

d)

$\theta=\ \frac{na}{\lambda}$

57.

The Fresnel distance is given by

a)

$Z_F=\frac{a}{\lambda}$

b)

$Z_F=\frac{\lambda}{a}$

c)

$Z_F=a^{2\ }\lambda$

d)

$Z_F=\frac{a^2}{\lambda}$

58.

The figure shows the diffraction pattern by a single slit which has a slit size of 0.017 mm and is placed 80 cm from the screen. The light used has a wavelength of 600 nm. what is the width of the central bright band?

a)

5.65 cm

b)

7.21 cm

c)

6.65 cm

d)

8.34 cm

59.

Which one is true about the slit separation, a, the distance D from the slits to the screen and the separation of the fringes, x, in a Young's double slit experiment?

a)

A

b)

B

c)

C

d)

D

60.

The figure shows a monochromatic light of wavelength $\lambda$ being incident onto a single slit. The slit size is a. What is the value of d in terms of $\lambda$ ?

a)

$\lambda$

b)

2 $\lambda$

c)

3 $\lambda$

d)

4 $\lambda$

61.

Coherent sources have :

a)

constant phase difference

b)

same frequency

c)

only A

d)

Both A and B

62.

a)

1

b)

2

c)

3

d)

4

63.

a)

1

b)

2

c)

3

d)

4

64.

a)

1

b)

2

c)

3

d)

4

65.

a)

1

b)

2

c)

3

d)

4

66.

a)

1

b)

2

c)

3

d)

4

67.

a)

1

b)

2

c)

3

d)

4

68.

a)

1

b)

2

c)

3

d)

4

69.

a)

1

b)

2

c)

3

d)

4

70.

a)

1

b)

2

c)

3

d)

4

71.

a)

1

b)

2

c)

3

d)

4

72.

a)

1

b)

2

c)

3

d)

4

73.

a)

1

b)

2

c)

3

d)

4

74.

a)

1

b)

2

c)

3

d)

4

75.

a)

1

b)

2

c)

3

d)

4

76.

a)

1

b)

2

c)

3

d)

4

77.

Huygen's conception of secondary waves...

a)

Allow 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 polarization

78.

Two coherent sources of light can be obtained by...

a)

Two different lamps

b)

Two different lamps but of the same power

c)

Two different lamps of same power and having the same colour

d)

None of the above

79.

Two coherent monochromatic light beams of intensities I and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are:

a)

5I and I

b)

5I and 3I

c)

9I and I

d)

9I and 3I

80.

By a monochromatic wave, we mean

a)

A single ray

b)

A single ray of a single colour

c)

Wave having a single wavelength

d)

Many rays of a single colour

81.

Wavelength of light of frequency 100Hz

a)

2 x 10⁶ m

b)

3 x 10⁶ m

c)

4 x 10⁶ m

d)

5 x 10⁶ m

82.

Wavefront means...

a)

All particles in it have same phase

b)

All particles have opposite phase of vibrations

c)

All particles have opposite phase of vibrations

d)

None of these

83.

Which one of the following phenomena is not explained by Huygen's construction of wavefront...

a)

Refraction

b)

Reflection

c)

Diffraction

d)

Origin of spectra

84.

Soap bubble appears coloured due to the phenomenon of...

a)

Interference

b)

Diffraction

c)

Dispersion

d)

Reflection

85.

Which of the following is conserved when light waves interfere...

a)

Intensity

b)

Energy

c)

Amplitude

d)

Momentum

86.

The dual nature of light is exhibited by...

a)

Photoelectric effect

b)

Refraction and interference

c)

Diffraction and reflection

d)

Diffraction and photoelectric effect

87.

Two beams of light having intensities I and 4I interfere to produce a fringe pattern on a screen. The phase difference between the beams is π/2 at point A and π at point B. Then the difference between the resultant intensities at A and B is...

a)

2 l

b)

4 l

c)

5 l

d)

7 l

88.

If the distance between a point source and screen is doubled, then intensity of light on the screen will become...

a)

Four times

b)

Double

c)

Half

d)

One-fourth

89.

Which of the following phenomena can explain quantum nature of light...

a)

Photoelectric effect

b)

Interference

c)

Diffraction

d)

Polarisation

90.

As a result of interference of two coherent sources of light, energy is...

a)

Increased

b)

Redistributed and the distribution does not vary with time

c)

Decreased

d)

Redistributed and the distribution changes with time

91.

A slit of width a is illuminated by white light. For red light (λ = 6500 Å), the first minima is obtained at θ=30^o. Then the value of a will be...

a)

3250 Å

b)

6.5 x 10^-4 mm

c)

1.24 microns

d)

2.6 x 10^-4 cm

92.

A double slit experiment is performed with light of wavelength 500 nm. A thin film of thickness 2 μm and refractive index 1.5 is introduced in the path of the upper beam. The location of the central maximum will...

a)

Remain unshifted

b)

Shift downward by nearly two fringes

c)

Shift upward by nearly two fringes

d)

Shift downward by 10 fringes

93.

In Young’s double slit experiment, distance between two sources is 0.1 mm. The distance of screen from the sources is 20 cm. Wavelength of light used is 5460 Å. Then angular position of the first dark fringe is...

a)

0.08°

b)

0.16°

c)

0.20°

d)

0.313°

94.

Two slits are separated by a distance of 0.5 mm and illuminated with light of λ=6000 Å. If the screen is placed 2.5 m from the slits. The distance of the third bright image from the centre will be...

a)

1.5 mm

b)

3 mm

c)

6 mm

d)

9 mm

95.

In Young double slit experiment, when two light waves form third minimum, they have...

a)

Phase difference of 3π

b)

Phase difference of $\frac{5\pi}{2}$

c)

Path difference of 3 $3\lambda$

d)

Path difference of $\frac{5\lambda}{2}$

96.

What will be the angle of diffracting for the first minimum due to Fraunhoffer diffraction with sources of light of wave length 550 nm and slit of width 0.55 mm

a)

0.001 rad

b)

0.01 rad

c)

1 rad

d)

0.1 rad

97.

A single slit of width 0.20 mm is illuminated with light of wavelength 500 nm. The observing screen is placed 80 cm from the slit. The width of the central bright fringe will be...

a)

1 mm

b)

2 mm

c)

4 mm

d)

5 mm

98.

Light of wavelength 589.3nm is incident normally on the slit of width 0.1mm. What will be the angular width of the central diffraction maximum at a distance of 1m from the slit

a)

0.68^o

b)

1.02^o

c)

0.34^o

d)

None of these

99.

What will be the angular width of central maxima in Fraunhoffer diffraction when light of wavelength 6000 A^o is used and slit width is 12 x 10^-5 cm

a)

2 rad

b)

3 rad

c)

1 rad

d)

8 rad

100.

Diffraction and interference of light suggest...

a)

Nature of light is electro-magnetic

b)

Wave nature

c)

Nature is quantum

d)

Nature of light is transverse

101.

The frequencies of X-rays, gama-rays and ultraviolet rays are respectively a, b and c. Then...

a)

a < b, b > c

b)

a > b, b > c

c)

a > b, b < c

d)

a < b, b < c

wave optics

Total questions: 101

Worksheet time: 3hrs 50mins

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