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First Year Physics Physical Optics 9.5 Explain whether the Youngs experiment is an experiment for studying interference or diffraction effects of light.


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9.5 Explain whether the Youngs experiment is an experiment for studying interference or diffraction effects of light.

9.1 Under what conditions two or more sources of light behave as coherent sources?
9.1 Under what conditions two or more sources of light behave as coherent sources?

9.1 Under what conditions two or more sources of light behave as coherent sources?

9.6 A light is incident normally on a grating which has 2500 lines per centimetre. Compute the wavelength of a spectral line for which the deviation in second order is 15.0^{\circ} .
 9.6  A light is incident normally on a grating which has 2500 lines per centimetre. Compute the wavelength of a spectral line for which the deviation in second order is  15.0^{\circ} .

9.6 A light is incident normally on a grating which has 2500 lines per centimetre. Compute the wavelength of a spectral line for which the deviation in second order is 15.0^{\circ} .

15. When crest of one wave falls over the trough of the other wave this phenomenon is known asa) Polarizationb) Constructive interferencec) Destructive interferenced) Diffraction
15. When crest of one wave falls over the trough of the other wave this phenomenon is known asa) Polarizationb) Constructive interferencec) Destructive interferenced) Diffraction

15. When crest of one wave falls over the trough of the other wave this phenomenon is known asa) Polarizationb) Constructive interferencec) Destructive interferenced) Diffraction

77. When a soap film (or oil film) on water is observed in day light it exhibits beautiful colours due to:a) Dispersionb) Refractionc) Reflectiond) Interference
77. When a soap film (or oil film) on water is observed in day light it exhibits beautiful colours due to:a) Dispersionb) Refractionc) Reflectiond) Interference

77. When a soap film (or oil film) on water is observed in day light it exhibits beautiful colours due to:a) Dispersionb) Refractionc) Reflectiond) Interference

22. The blue to the sky is due toa) Diffractionb) Reflectionc) Polarizationd) Scattering
22. The blue to the sky is due toa) Diffractionb) Reflectionc) Polarizationd) Scattering

22. The blue to the sky is due toa) Diffractionb) Reflectionc) Polarizationd) Scattering

52. Which of the following demonstrates that light waves are transverse waves?a) Interferenceb) Polarizationc) Diffractiond) Reflection
52. Which of the following demonstrates that light waves are transverse waves?a) Interferenceb) Polarizationc) Diffractiond) Reflection

52. Which of the following demonstrates that light waves are transverse waves?a) Interferenceb) Polarizationc) Diffractiond) Reflection

1. Optical active crystals rotates thea) Vibrating planeb) polarization planec) diffraction planed) interference plane
1. Optical active crystals rotates thea) Vibrating planeb) polarization planec) diffraction planed) interference plane

1. Optical active crystals rotates thea) Vibrating planeb) polarization planec) diffraction planed) interference plane

64. Which one of the following has greater frequency?a) Ultra-violet raysb) Visible lightc) Infra-red radiationd) Gamma rays
64. Which one of the following has greater frequency?a) Ultra-violet raysb) Visible lightc) Infra-red radiationd) Gamma rays

64. Which one of the following has greater frequency?a) Ultra-violet raysb) Visible lightc) Infra-red radiationd) Gamma rays

20. In an interference patterna) Bright fringes are wider than dark fringesb) Dark fringes are wider than bright fringec) Both dark and bright fringes are of equal widthd) Central fringes are brighter than the outer fringes
20. In an interference patterna) Bright fringes are wider than dark fringesb) Dark fringes are wider than bright fringec) Both dark and bright fringes are of equal widthd) Central fringes are brighter than the outer fringes

20. In an interference patterna) Bright fringes are wider than dark fringesb) Dark fringes are wider than bright fringec) Both dark and bright fringes are of equal widthd) Central fringes are brighter than the outer fringes

9.8 Blue light of wavelength 480 \mathrm{~nm} illuminates a diffraction grating. The second order image is formed at an angle of 30^{\circ} from the central image. How many lines in a centimetre of the grating have been ruled?
 9.8  Blue light of wavelength  480 \mathrm{~nm}  illuminates a diffraction grating. The second order image is formed at an angle of  30^{\circ}  from the central image. How many lines in a centimetre of the grating have been ruled?

9.8 Blue light of wavelength 480 \mathrm{~nm} illuminates a diffraction grating. The second order image is formed at an angle of 30^{\circ} from the central image. How many lines in a centimetre of the grating have been ruled?

26. The wavelength of X-rays is of the order ofa) 10 A^{\circ} b) 1000 \mathrm{~A}^{\circ} c) 1 A^{\circ} d) 100 A^{\circ}
26. The wavelength of X-rays is of the order ofa)  10 A^{\circ} b)  1000 \mathrm{~A}^{\circ} c)  1 A^{\circ} d)  100 A^{\circ}

26. The wavelength of X-rays is of the order ofa) 10 A^{\circ} b) 1000 \mathrm{~A}^{\circ} c) 1 A^{\circ} d) 100 A^{\circ}

9.9 How would you manage to get more orders of spectra using a diffraction grating?
 9.9  How would you manage to get more orders of spectra using a diffraction grating?

9.9 How would you manage to get more orders of spectra using a diffraction grating?

Example 9.1: The distance between the slits in Youngs double slit experiment is 0.25 \mathrm{~cm} . Interference fringes are formed on a screen placed at a distance of 100 \mathrm{~cm} from the slits. The distance of the third dark fringe from the central bright fringe is 0.059 \mathrm{~cm} . Find the wavelength of the incident light.
Example 9.1: The distance between the slits in Youngs double slit experiment is  0.25 \mathrm{~cm} . Interference fringes are formed on a screen placed at a distance of  100 \mathrm{~cm}  from the slits. The distance of the third dark fringe from the central bright fringe is  0.059 \mathrm{~cm} . Find the wavelength of the incident light.

Example 9.1: The distance between the slits in Youngs double slit experiment is 0.25 \mathrm{~cm} . Interference fringes are formed on a screen placed at a distance of 100 \mathrm{~cm} from the slits. The distance of the third dark fringe from the central bright fringe is 0.059 \mathrm{~cm} . Find the wavelength of the incident light.

16. In Youngs double slit experiment the fringe spacing is equal toa) d \lambda D b) 2 \lambda d / D c) \lambda \mathrm{D} / \mathrm{d} d) \lambda d / D
16. In Youngs double slit experiment the fringe spacing is equal toa)  d \lambda D b)  2 \lambda d / D c)  \lambda \mathrm{D} / \mathrm{d} d)  \lambda d / D

16. In Youngs double slit experiment the fringe spacing is equal toa) d \lambda D b) 2 \lambda d / D c) \lambda \mathrm{D} / \mathrm{d} d) \lambda d / D

Example 9.2: Yellow sodium light of wavelength 589 \mathrm{~nm} emitted by a single source passes through two narrow slits 1.00 \mathrm{~mm} apart. The interference pattern is observed on a screen 225 \mathrm{~cm} away. How far apart are two adjacent bright fringes?
Example 9.2: Yellow sodium light of wavelength  589 \mathrm{~nm}  emitted by a single source passes through two narrow slits  1.00 \mathrm{~mm}  apart. The interference pattern is observed on a screen  225 \mathrm{~cm}  away. How far apart are two adjacent bright fringes?

Example 9.2: Yellow sodium light of wavelength 589 \mathrm{~nm} emitted by a single source passes through two narrow slits 1.00 \mathrm{~mm} apart. The interference pattern is observed on a screen 225 \mathrm{~cm} away. How far apart are two adjacent bright fringes?

49. Modern view about nature of light is that light behaves as:a) Waves onlyb) Particles onlyc) Both waves and particlesd) None of these
49. Modern view about nature of light is that light behaves as:a) Waves onlyb) Particles onlyc) Both waves and particlesd) None of these

49. Modern view about nature of light is that light behaves as:a) Waves onlyb) Particles onlyc) Both waves and particlesd) None of these

36. In Youngs double slit experiment if \mathrm{d} is the separation between the slits destructive interference will occur ifa) d \sin \theta=m \lambda:(m=06162 \ldots) b) d \sin \theta=(m+1 / 2) \lambda:(m=06162 \ldots) c) 2 d \sin \theta=m / \lambda:(m=06162 \ldots) d) 2 d \sin \theta=m \lambda:(m=06162 \ldots)
36. In Youngs double slit experiment if  \mathrm{d}  is the separation between the slits destructive interference will occur ifa)  d \sin \theta=m \lambda:(m=06162 \ldots) b)  d \sin \theta=(m+1 / 2) \lambda:(m=06162 \ldots) c)  2 d \sin \theta=m / \lambda:(m=06162 \ldots) d)  2 d \sin \theta=m \lambda:(m=06162 \ldots)

36. In Youngs double slit experiment if \mathrm{d} is the separation between the slits destructive interference will occur ifa) d \sin \theta=m \lambda:(m=06162 \ldots) b) d \sin \theta=(m+1 / 2) \lambda:(m=06162 \ldots) c) 2 d \sin \theta=m / \lambda:(m=06162 \ldots) d) 2 d \sin \theta=m \lambda:(m=06162 \ldots)

9.2 Calculate the wavelength of light which illuminates two slits 0.5 \mathrm{~mm} apart and produces an interference pattern on a screen placed 200 \mathrm{~cm} away from the slits. The first bright fringe is observed at a distance of 2.40 \mathrm{~mm} from the central bright image.
 9.2  Calculate the wavelength of light which illuminates two slits  0.5 \mathrm{~mm}  apart and produces an interference pattern on a screen placed  200 \mathrm{~cm}  away from the slits. The first bright fringe is observed at a distance of  2.40 \mathrm{~mm}  from the central bright image.

9.2 Calculate the wavelength of light which illuminates two slits 0.5 \mathrm{~mm} apart and produces an interference pattern on a screen placed 200 \mathrm{~cm} away from the slits. The first bright fringe is observed at a distance of 2.40 \mathrm{~mm} from the central bright image.

13. Which one of the following is nearly monochromatic light?a) Light form fluorescent tubeb) Light form sodium lampc) Light form neon lampd) Light form simple lamp
13. Which one of the following is nearly monochromatic light?a) Light form fluorescent tubeb) Light form sodium lampc) Light form neon lampd) Light form simple lamp
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13. Which one of the following is nearly monochromatic light?a) Light form fluorescent tubeb) Light form sodium lampc) Light form neon lampd) Light form simple lamp

9.7 Could you obtain Newtons rings with transmitted light? If yes would the pattern be different from that obtained with reflected light?
9.7 Could you obtain Newtons rings with transmitted light? If yes would the pattern be different from that obtained with reflected light?
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9.7 Could you obtain Newtons rings with transmitted light? If yes would the pattern be different from that obtained with reflected light?

9.4 In the Youngs experiment one of the slits is covered with blue filter and other with red filter. What would be the pattern of light intensity on the screen?
 9.4  In the Youngs experiment one of the slits is covered with blue filter and other with red filter. What would be the pattern of light intensity on the screen?
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9.4 In the Youngs experiment one of the slits is covered with blue filter and other with red filter. What would be the pattern of light intensity on the screen?

62. Michelson interferometer is an instrument used to measure:a) Frequency of lightb) Intensity of lightc) Amplitude of lightd) Wavelength of light
62. Michelson interferometer is an instrument used to measure:a) Frequency of lightb) Intensity of lightc) Amplitude of lightd) Wavelength of light
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62. Michelson interferometer is an instrument used to measure:a) Frequency of lightb) Intensity of lightc) Amplitude of lightd) Wavelength of light

9.5 Explain whether the Youngs experiment is an experiment for studying interference or diffraction effects of light.
 9.5  Explain whether the Youngs experiment is an experiment for studying interference or diffraction effects of light.
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9.5 Explain whether the Youngs experiment is an experiment for studying interference or diffraction effects of light.

48. A photon of light enters into a block of glass after traveling through a vacuum. The energy of the photon on entering the glass blocka) Increasesb) Decreasesc) Remains the samed) None of these
48. A photon of light enters into a block of glass after traveling through a vacuum. The energy of the photon on entering the glass blocka) Increasesb) Decreasesc) Remains the samed) None of these
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48. A photon of light enters into a block of glass after traveling through a vacuum. The energy of the photon on entering the glass blocka) Increasesb) Decreasesc) Remains the samed) None of these

9.10 An X-ray beam of wavelength \lambda undergoes a first order reflection from a crystal when its angle of incidence to a crystal face is 26.5^{\circ} and an X-ray beam of wavelength 0.097 \mathrm{~nm} undergoes a third order reflection when its angle of incidence to that face is 60.0^{\circ} . Assuming that the two beams reflect from the same family of planes calculate (a) the interplanar spacing of the planes and (b) the wavelength \lambda .
9.10 An X-ray beam of wavelength  \lambda  undergoes a first order reflection from a crystal when its angle of incidence to a crystal face is  26.5^{\circ}  and an X-ray beam of wavelength  0.097 \mathrm{~nm}  undergoes a third order reflection when its angle of incidence to that face is  60.0^{\circ} . Assuming that the two beams reflect from the same family of planes calculate (a) the interplanar spacing of the planes and (b) the wavelength  \lambda .
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9.10 An X-ray beam of wavelength \lambda undergoes a first order reflection from a crystal when its angle of incidence to a crystal face is 26.5^{\circ} and an X-ray beam of wavelength 0.097 \mathrm{~nm} undergoes a third order reflection when its angle of incidence to that face is 60.0^{\circ} . Assuming that the two beams reflect from the same family of planes calculate (a) the interplanar spacing of the planes and (b) the wavelength \lambda .

9.7 Sodium light (\lambda=589 \mathrm{~nm}) is incident normally on a grating having 3000 lines per centimetre. What is the highest order of the spectrum obtained with this grating?
 9.7  Sodium light  (\lambda=589 \mathrm{~nm})  is incident normally on a grating having 3000 lines per centimetre. What is the highest order of the spectrum obtained with this grating?
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9.7 Sodium light (\lambda=589 \mathrm{~nm}) is incident normally on a grating having 3000 lines per centimetre. What is the highest order of the spectrum obtained with this grating?

14. Two sources of light are coherent if they emit rays ofa) Same wavelengthb) Same amplitude of vibrationc) Same wavelength with constant phase differenced) Same amplitude and wavelength
14. Two sources of light are coherent if they emit rays ofa) Same wavelengthb) Same amplitude of vibrationc) Same wavelength with constant phase differenced) Same amplitude and wavelength
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14. Two sources of light are coherent if they emit rays ofa) Same wavelengthb) Same amplitude of vibrationc) Same wavelength with constant phase differenced) Same amplitude and wavelength

9.5 Explain whether the Youngs experiment is an experiment for studying interference or diffraction effects of light.
9.5 Explain whether the Youngs experiment is an experiment for studying interference or diffraction effects of light.
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9.5 Explain whether the Youngs experiment is an experiment for studying interference or diffraction effects of light.

9.2 How is the distance between interference fringes affected by the separation between the slits of Youngs experiment? Can fringes disappear?
9.2 How is the distance between interference fringes affected by the separation between the slits of Youngs experiment? Can fringes disappear?
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9.2 How is the distance between interference fringes affected by the separation between the slits of Youngs experiment? Can fringes disappear?

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