NO Questions Option-A 1 Wave nature of light evidenced by Photoelectric effect 2 Two sources are said to be coherent Same wavelength
3
When a thin film of ol or soap bubble is illuminated with white light, multiple colours appears, This is due to
Diffraction
4 Condition for Destructive interfence pattern is
Path difference is even multiple of λ/2
5 Condition for Constructive interfence pattern is
Path difference is odd multiple of λ/2
6 Light waves are Longitudinal waves
7 Which of the following does not supports the wave nature of light Interference 8
A phase difference of π between two interfacing beams is equivalent to path difference
2λ 9 In reflected light the central fringe of
Newtons Ring is Dark
10 In Transmitted light the central fringe of
Newtons Ring is Dark
11 In Newtons ring, the diameter of bright ring is
propotional to Odd natural number
12 Extended source is needed in Young's double slit experiemnt
13 In interference with two coherant sources, the fringe width varies
Directly with wavelength
14 Interfernce occours in Longitudinal waves only
15 Newton's rings are Locus of points of
equal thickness
16 In Newton's ring experiemnt, diameter of rings formed is praportional to λ 17 One of the following phenomena cannot be
explained by wave theory of light Polarization 18
To demonstrate the phenomena of interference, we require two sources of which emits radiation of
Same frequency
19 Which of the following interference is produced by the division of wavefront Fabry Perot Interferrometer
20
When a thin sheet of mica is introduced in the path of one of the interfacing beam, then the fringe width
Increases
22 In Fresnel's Biprism experiemt the central fringe is Bright 23 If Young's appratus is immersed in water, then the fringe width Increases
24
In Newton's ring experiement, the distance between lens and the plate is increased, the order of the ring at a given point is
Increases
25
In Young's double slit experiement, the monochromatic source of yellow light is replaced by red light, then Frige width will be
Increases
26 An excessively thin film appears in reflected
light White
27
In Newtons ring experiment, if the
planconvex lens is replaced by Biconvex lens then,
Width of fringes reduced to half of its origional value 28 In antireflection coating wavelength is in the
order of λ
29 Air-Wedge fringes are always Circular 30
A path difference of 3λ/2 between two waves corresponds to the phase difference of
3π/2
31 Which of the following does not changes the
refraction Wavelength
32 For interference pattern Width of dark and bright bands are equal
33 To observe colour in thin films, film must
exposed to Broad source
34 Width of fringes for wedge shape film
changes with the increase of wedge angle Increases
35 In Newton's ring expt. The air film is repalced by water film, then the diameter of the ring Decreases
36 In Newton's ring expt. Which properties are
measured Wavelength of light
37 When Newton's ring is observed under white light, which of the following statement is true Only first few coloured rings will be visible
38 Which of the following are coherant sources A 60 W and A 100 W bulbs
39 The wave nature of light is manifested by the
phenomena called as Interference
40 The two sources are said to be coherent if
the emitted wave exhibits Same wavelength 41 The phase difference of wave at glass – air
42
In the interference pattern of two waves, the intensities are 9:1, so the ratio of maximum to minimum intensities is
2:01
43
If a light wave travelling a distance‘t’ through a medium of refractive index ‘μ’ then the product ‘μt’ is associated with
Path difference
44 In destructive interference pattern, the path difference is odd multiple of λ/4 45 In constructive interference pattern, the path difference is even multiple of λ/4
46
When t=0, the film is dark and thickness increases gradually, the results in appearance of
Maxima and minima alternatively
47 If a film of large thickness is illuminated by awhite light then it shows Interference pattern 48 A very thick film is illuminated by a white
light, the reflected light shows Presence of colors 49 For bright or dark fringes of any particular
order, the path difference must be Constant
50 The separation distance between two
successive fringes (dark or bright) must be Width of fringes
51
If Plano-convex lens is replaced by Bi-convex lens, then the converging power of lens become
Half
52 The width of fringes reduces to half at Maxima 53 The eyes are more sensitive to which
wavelength of light 6000Ǻ
54 In interference pattern, all maxima have Same intensity 55 In diffraction, the intensity of central maxima
is Minimum
56 In interference pattern, the fringes are
equally spaced have Different width
57 In diffraction pattern, the fringes are not equally spaced have Different width 58 For constructive interference, the path difference is nλ
59 For destructive interference, the path
difference is (2n-1)λ/2
60 For constructive interference, the phase
difference is (2m-1)π
61 For destructive interference, the phase
difference is (2m-1)π
62 Interference is caused by superposition of
--- waves Two
64 When light traveling in air gets reflected from
water surface, there is --- No phase change 65 When light traveling in air gets transmitted in
water, there is --- No phase change
66 Division of wavefront can be achieved with Extended sources 67 Refractive index of one medium with respect to another cannot be ˂ 1
68
Formation of colors in light reflected from or transmitted through soap films is due to the phenomena of ---- light
Interference
69
If the refractive index of the medium of a wedge shaped film increases, fringe width -
--Increases
70 In Newton's ring experiment, as we move
away from center the fringe width--- Increases 71 The diffraction is divided into two different
categories Fresnel
72 In Fraunhofer diffraction, the diffracted
wavefront is Plane
73 In Fresnel diffraction, the diffracted
wavefront is Plane
74 For first minimum, the order of spectrum is One 75 The bending property of light at the sharp
edge of the obstacle is Interference 76 In Fraunhofer diffraction at circular
aperature, the radius of central disc is
Independent on diameter of aperature 77 Slit to screen distance is finite in --- diffraction Fresnel
78 Slit to screen distance is infinite in --- diffraction Fresnel 79 Source to slit distance is finite in ---
diffraction Fresnel
80 Source to slit distance is Infinite in ---
diffraction Fresnel
81 In Fresnel diffraction, the wavefront incident
on slit is --- Spherical
82 In Fraunhofer diffraction, the wavefront
incident on slit is --- Spherical
83 Light eneters the geometrical shadow of slit in --- Fresnel 84 Diffraction of light manifest its --- nature Particle
85
There is path difference between the rays coming from a source before entering the slit in
--Fresnel
86
There is no path difference between the rays coming from a source before entering the slit in
87 To observe the diffraction pattern lenses are required in Fraunhofer
88 A line on diffraction grating is An opaque space
89 In Fraunhofer diffraction at a single slit, as slit
width decreased , the adjecent minima Come closer
90 Which of the following depends on the total number of lines on the grating Intensity of principal maxima
91 Which orders of maxima cannot be absent in the diffraction pattern of any grating 0 92 Which of the following depends on grating
element
Position of principal maxima
93 Scattering of light by very small particles can
be considered to be a special case of Reflection 94 Diffraction appears if the size of obstacle in
path of rays is the order of 1 mm 95 In a single slit experiments, if the slit width is
Option-B Option-C Option-D Correct Option Interference Black body radiation Nuclear emission B Same amplitude Constant phase
diffeence All of the above D
Polarization Total Internal Reflection Interference D
Path difference is odd multiple of λ/2
Path difference is Integral
multiple of λ/2 None of the above B
Path difference is even multiple of λ/2
Path difference is Integral
multiple of λ/2 None of the above B
Transverse waves Both A and B None of the above C
Polarization Compton effect Diffraction C
λ λ/2 None of the above C
Non-uniform Bright None of the above A
Non-uniform Bright None of the above C
Natural number Even natural number Square root of
natural number D
Biprism Experiment Newton's ring experiment None of the above C Inversly with
wavelength
Directly with separation between slits
Inversly with distance between slits and screen
A
Transverse wave only Electromagnetic wave only All of the above D Locus of points of
equal Inclination
Locus of points of equal
thickness and Inclination Neither A or B A
λ2 Square root of λ
Inversly
praportional to square root of λ
C
Diffraction Photoelectric effect Interference C
Nearly the same frequency
Same frequency and have a definite phase relationship
Different
wavelength C
Michelson's
Interferrometer Newton's ring Fresnel's Biprism D
Decreases Remains Unchanged None of the above C
Light consist of particles
Light neither particle nor wave
Light is both particle
Dark First dark then bright First bright then dark A
Decreases Remains Unchanged None of the above B
Decreases Remains Unchanged Fringe pattern disappears C
Decreases Unchanged Fringe pattern disappears A
Black Red Yellow B
Width of fringes
increases to double of its origional value
Width of fringes remains
same None of these A
λ/2 λ/4 2λ C
Spherical Cylindrical Straight D
π/3 3π 2π/3 C
Frequency Velocity Intensity B
Width of dark and bright bands are Unequal
Width of bright bands are
lesser than dark band None of these A
Point source Either A or B None of the above A
Decreases Remains same Difficult to say B
Increases Remains same None of the above A
Thickness of the film Refractive index of liquid All of the above D All clooured rings will
be visible All rings will disappears None of the above A Two bulbs each of 60
Watt
Two halves of a 60 Watt bulbs
Virtual sources obtained by a Biprism
A
Diffraction Reflection Refraction A
same amplitude Constant phase
difference All of above. D
9:01 3:01 4:01 D
Phase difference Optical path None of the above C
λ/2 λ 2λ B
λ/2 λ 2λ B
Maxima and minima simultaneously Maxima Minima A
No interference pattern Diffraction pattern None of the above B
No colors No any pattern None of the above B
Increases Decreases None of the above A
Band width Fringe width None of the above C
Doubled Multiple order None of the above B
Minima Central dark spot Central bright spot C
6500 Ǻ 5500 Ǻ 5890 Ǻ C
Lower intensity Higher intensity None of the above A
Maximum No intensity None of the above B
Same width Average width None of the above B
Same width Average width None of the above A
(2n-1)λ/2 (2n-1)π 2nπ A
nλ (2n-1)π 2nπ A
2mπ mλ (2m-1)λ/2 B
2mπ mλ (2m-1)λ/2 A
Three Four Any Number of D
Phase change of π/2 Phase change of π/4 Phase change of π D
Phase change of π/2 Phase change of π/4 Phase change of π A
Point sources Both A and B Neither A or B C
> 1 1.5 None of the above D
Diffraction Polarization Scattering A
Decreases Remains same First increases and
then decreases B
Decreases Remains same First increases and
then decreases B
Fraunhofer Fresnel and Fraunhofer None of the above C
Spherical Cylindrical None of the above A
Spherical Either spherical or
cylindrical None of the above C
Two Three None of the above A
Dispersion Diffraction pattern Polarization C
Large as the diameter of aperature is large
Small as the diameter of
aperature is large None of these C
Fraunhofer Both A and B None of the above A
Fraunhofer Both A and B None of the above B
Fraunhofer Both A and B None of the above A
Fraunhofer Both A and B None of the above B
Cylindrical A or B Plane C
Cylindrical A or B Plane D
Fraunhofer Both A and B None of the above C
Wave Dual nature None of the above B
Fraunhofer Both A and B None of the above A
Fresnel Both A and B None of the above A A slit A slit and an opaque space None of the above C
Move Apart Remains at fixed position Increases initailly
and then decraeses B
Intensity of minima Position of principal maxima Position of minima A
1 2 0 and 1 D
Position of minima Maximum order All above D
Refraction Interefernce Diffraction D
10-4 mm 0.1 mm 1 cm B
Fringes become
narrower Fringes become wider
Colour of fringes
Topic Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference
Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference
Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference Interference
Interference Interference Interference Interference Interference Interference Interference Diffraction Diffraction Diffraction Diffraction Diffraction Diffraction Diffraction Diffraction Diffraction Diffraction Diffraction Diffraction Diffraction Diffraction Diffraction Diffraction
Diffraction Diffraction Diffraction Diffraction Diffraction Diffraction Diffraction Diffraction Diffraction
