CHAPTER 9: PHYSICAL OPTICS 1. The locus of all points in a medium having 8. The condition for destructi...
CHAPTER 9: PHYSICAL OPTICS
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1. The
locus of all points in a medium having
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8. The condition
for destructive interference of
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the
same phase of vibration is called
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two
coherent beams is that the path
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a)
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Crest
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difference
should be
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b)
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Trough
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a)
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Integral
multiple of λ/2
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c)
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Wavelength
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b)
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Integral
multiple of λ
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d)
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Wave
front
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c) Odd Integral multiple of λ/2
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d) Even integral multiple of λ
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2.
The
distance between two consecutive wave fronts is called:
a) Time period
b) Frequency
c) Wavelength
d) Displacement
3.
Which one
of the following is nearly monochromatic light?
a) Light form fluorescent tube
b) Light form sodium lamp
c) Light form neon lamp
d) Light form simple lamp
4.
Two
sources of light are coherent if they emit rays of
a) Same wavelength
b) Same amplitude of vibration
c)
Same wave
length with constant phase difference
d) Same amplitude and wavelength
5.
Sodium
chloride in a flame gives out pure:
a) Blue light
b) Yellow light
c) Red light
d) White light
6.
When
crest of one wave falls over the trough of the other wave, this phenomenon is
known as
a) Polarization
b) Constructive interference
c) Destructive interference
d) Diffraction
7.
The
condition for constructive interference of two coherent beams is that the path
difference should be
a) Integral multiple of λ/2
b) Integral multiple of λ
c)
Odd
Integral multiple of λ/2
d) Even integral multiple of λ
10.
In Young
double slit experiment, if white light is used
a) Alternate dark and bright fringes will be
seen
b) Colored fringes will be seen
c) No interference fringes will be seen
d) Impossible to predict
11. The center of Newton’s rings is_________
due to
destructive interference:
a) Bright
b) Dark
c) Colorless
d) Red
12.
When the
Newton’s rings are observed with reflected light, the central spot is:
a) Red
b) Blue
c) Dark
d) Bright
13.
When the
Newton’s rings are observed with transmitted light, the central spot is:
a) Red
b) Blue
c) Dark
d) Bright
14.
The
appearance of Color in thin films is due to
a) Diffraction
b) Dispersion
c)
Interference
d) Polarization
15.
Soap film
exhibit brilliant colors in sun light due to:
a) Dispersion of light
b) Interference of light
c) Diffraction of light
d) Scattering of light
16.
A light
ray traveling form rarer to denser medium suffers a phase change of:
a)
60°
b)
90°
c)
180°
d)
45°
17.
A light
ray traveling form denser to rarer medium suffers a phase change of:
a)
0°
b)
90°
c)
180°
d)
45°
18. One angstrom is equal to:
a)
10−9
b)
10−8
c)
10−10
d)
10−11
19.
2
sin = is
called:
a)
Laplace’s
equaiton
b) Reflection equation
c) Refraction equaion
d) Bragg’s equation
20.
sin
= is
called:
a) Laplace’s equaiton
b) Slit Diffraction Condition
c) Refraction equaion
d) Bragg’s equation
21.
Bending
of light around the edges of an obstacle is known as:
a) Refraction
b) Polarization
c) Diffraction
d) Interference
22.
The
bending of a beam of light when it passes from one medium to another is known
as:
a) Refraction
b) Reflection
c) Diffraction
d) Dispersion
23.
The effective
path difference between two reflected beams, in x-ray diffraction by crystal
is:
a)
sin
b)
2
sin
c)
sin 2
d)
sin 2
24.
The equation
of Michelson’s interferometer is:
a)
= 2
b)
= 4
c)
=
d)
= 2
Q. No.
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Ans.
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Q. No.
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Ans.
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1
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d
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13
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d
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2
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c
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14
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c
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3
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b
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15
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b
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4
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c
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16
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c
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5
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b
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17
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a
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6
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b
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18
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c
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7
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b
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19
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d
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8
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c
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20
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b
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9
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d
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21
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c
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10
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c
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22
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a
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11
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b
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23
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b
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12
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c
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24
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a
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COMMENTS