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Class 12 Physics
Wave Optics
Quiz 2
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In vacuum, the speed of light depends upon :
0%
frequency
0%
velocity
0%
wave length
0%
None of these
Explanation
None of these
The fringe width (β) of a diffraction pattern and the slit width d are related as:
0%
β ∝ d
0%
β ∝\(\frac{1}{d}\)
0%
β ∝ √d
0%
β ∝ \(\frac{1}{d^2}\)
Explanation
β ∝\(\frac{1}{d}\)
C.V. Raman was awarded the Nobel prize for his work associated with which of the following phenomenon of radiations?
0%
scattering
0%
diffraction
0%
interference
0%
polarisation
Explanation
scattering
Light takes 10
-10
to cross a glass slab. What is the thickness of the glass slab?
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2 cm
0%
3 cm
0%
2.5 cm
0%
3.5 cm
Explanation
3 cm
In Young's double slit experiment, the central point on the screen is:
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bright
0%
dark
0%
first bright and later dark
0%
first dark and later bright
Explanation
bright
Between the slit is id\ the distance between the slit and the screen is α, with light of wavelength λ, the number of fringe observed per metre on the screen is:
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\(\frac{δy}{α}\)
0%
\(\frac{Dα}{λ}\)
0%
\(\frac{α}{Dλ}\)
0%
\(\frac{λd}{D}\)
Explanation
\(\frac{δy}{α}\)
In Young's double slit experiment the distance between the slit and the screen is doubled and the separation between the slit is reduced to half. The fringe width:
0%
is doubled
0%
become four time
0%
is halfed
0%
remain unchanged
Explanation
become four time
In a Young's double slit experiment the distance between the slit is 1 mm and the distance of screen from the slit is 1 m. If light of wavelength 6000 A is used then the fringe width is:
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0.4 mm
0%
0.5 mm
0%
0.6 mm
0%
0.8 mm
Explanation
0.6 mm
A person cannot see object clearly beyond 50 cm. The pow er of the lens to correct his vision is :
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+0.5 dioptre
0%
-0.5 dioptre
0%
-2 dioptre
0%
+2 dioptre
Explanation
-2 dioptre
A phase difference of 5π corresponds to a path difference (in terms of λ) of:
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5λ
0%
10λ.
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5λ/2
0%
2λ
Explanation
5λ/2
A polaroid produces a strong beam of light which is :
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circularly polarised
0%
elliptically polarised
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plane polarised
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unpolarised
Explanation
plane polarised
Images of a distant lamp seen through a fire cloth rotate on rotating the cloth. This is due to the phenomenon of:
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interference
0%
diffraction
0%
polarisation
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scattering
Explanation
diffraction
A young's double slit experiment uses a monochromatic source. The shape of interference fringes formed on a screen is :
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parabola
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straight line
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circle
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hyperbola
Explanation
straight line
A monochromatic light is refracted from air into a glass of refractive index µ. The ratio of the wavelengths of the incident and the refracted waves is:
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1 : µ
0%
1 : µ²
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µ : 1
0%
µ² : 1
Explanation
µ : 1
The focal length of the lens is 50 cm; then its power is:
0%
+2D
0%
+1D
0%
-2D
0%
-1D
Explanation
+2D
In the above question, the number of the lens is:
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+2
0%
+1
0%
-2
0%
-1
Explanation
+2
The refractive index of diamond is about:
0%
1
0%
1.42
0%
2.42
0%
4.24
Explanation
2.42
Two lenses having power +6 D and -4 D are placed in contact. The power of the combination is
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-2D
0%
-4D
0%
+4D
0%
+2 D
Explanation
+2 D
Diffraction was discovered by :
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Grimaldi
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Thomas Young
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Malus
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Huygens
Explanation
Grimaldi
The electromagnetic wave theory of light fails to explain :
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compton effect
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photoelectric effect
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neither (a) nor (b)
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Both (a) and (b)
Explanation
compton effect
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