Wave Optics

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Q. A beam of light passes through a narrow slit and produces a diffraction pattern. What is the angle of the first minimum? (2019)
  • A. λ/a
  • B. λ/2a
  • C. 2λ/a
  • D. 3λ/a
Q. A beam of light passes through a narrow slit and produces a diffraction pattern. What happens to the width of the central maximum if the slit width is decreased? (2019)
  • A. It increases
  • B. It decreases
  • C. It remains the same
  • D. It becomes zero
Q. A beam of light passes through a narrow slit and produces a diffraction pattern. What is the angle for the first minimum? (2022)
  • A. λ/a
  • B. 2λ/a
  • C. λ/2a
  • D. a/λ
Q. A thin film of oil (n = 1.5) is on water (n = 1.33). What is the condition for destructive interference for light of wavelength 600 nm in air? (2022)
  • A. 2t = (m + 1/2)λ
  • B. 2t = mλ
  • C. 2t = (m + 1)λ
  • D. 2t = (m - 1/2)λ
Q. If the wavelength of light used in a diffraction grating is increased, what happens to the angular separation of the fringes? (2023)
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes zero
Q. If the wavelength of light used in a double-slit experiment is increased, what happens to the distance between the fringes? (2022)
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes zero
Q. If the wavelength of light used in a double-slit experiment is increased, what happens to the fringe separation? (2022)
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes zero
Q. If the wavelength of light used in a single-slit diffraction experiment is increased, what will happen to the position of the first minimum? (2022)
  • A. It moves closer to the center
  • B. It moves away from the center
  • C. It remains unchanged
  • D. It disappears
Q. If the wavelength of light used in a single-slit diffraction experiment is increased, what happens to the width of the central maximum? (2023)
  • A. It decreases
  • B. It increases
  • C. It remains the same
  • D. It becomes zero
Q. In a diffraction pattern, if the distance between the slits is decreased, what happens to the central maximum? (2022)
  • A. It becomes wider
  • B. It becomes narrower
  • C. It disappears
  • D. It remains unchanged
Q. In a diffraction pattern, the central maximum is observed to be the brightest. What is the reason for this? (2022)
  • A. It has the least path difference
  • B. It has the maximum path difference
  • C. It has the maximum intensity
  • D. It has the minimum intensity
Q. In a double-slit experiment, if the distance between the slits is 0.1 mm and the screen is 1 m away, what is the fringe separation for light of wavelength 500 nm? (2020)
  • A. 0.5 mm
  • B. 0.1 mm
  • C. 0.2 mm
  • D. 0.3 mm
Q. In a double-slit experiment, if the wavelength of light is halved, what happens to the fringe width? (2020)
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. In a thin film interference experiment, what type of interference occurs when light reflects off a denser medium? (2023)
  • A. Constructive interference
  • B. Destructive interference
  • C. No interference
  • D. Total internal reflection
Q. In a thin film interference, if the film is viewed in white light, which color will be seen at the center of the film? (2022)
  • A. Red
  • B. Blue
  • C. Green
  • D. Yellow
Q. In a thin film of oil on water, what color will be seen if the film thickness is such that destructive interference occurs for blue light? (2021)
  • A. Red
  • B. Green
  • C. Blue
  • D. Yellow
Q. In a thin film of oil on water, which color will appear at the center of the pattern if the film thickness is such that it causes constructive interference for blue light? (2022)
  • A. Red
  • B. Green
  • C. Blue
  • D. Yellow
Q. In a thin film of oil on water, which color will appear at the center of the pattern if the film is viewed in white light? (2022)
  • A. Red
  • B. Blue
  • C. Green
  • D. Yellow
Q. In a thin film of oil on water, which color will appear at the center of the pattern if the film thickness is such that it causes constructive interference for red light? (2022)
  • A. Red
  • B. Blue
  • C. Green
  • D. Yellow
Q. In thin film interference, which of the following will cause a shift in the interference pattern? (2022)
  • A. Change in wavelength
  • B. Change in film thickness
  • C. Change in angle of incidence
  • D. All of the above
Q. What is the effect of increasing the slit width in a single-slit diffraction experiment? (2021)
  • A. Fringe width increases
  • B. Fringe width decreases
  • C. No effect on fringe width
  • D. Fringe pattern disappears
Q. What is the effect on the fringe separation in a double-slit experiment if the distance between the slits and the screen is increased? (2021)
  • A. Fringe separation decreases
  • B. Fringe separation increases
  • C. Fringe separation remains the same
  • D. Fringe separation becomes zero
Q. What is the maximum number of bright fringes observed in a double-slit experiment if the wavelength of light is 500 nm and the distance between the slits is 0.1 mm? (2020)
  • A. 5
  • B. 10
  • C. 20
  • D. 15
Q. What is the maximum number of bright fringes that can be observed in a double-slit experiment with a given wavelength? (2023)
  • A. Depends on the slit width
  • B. Depends on the distance to the screen
  • C. Depends on the wavelength and slit separation
  • D. Always infinite
Q. What is the minimum thickness of a soap bubble for which the first order of constructive interference occurs for light of wavelength λ? (2019)
  • A. λ/4
  • B. λ/2
  • C. λ
  • D. 3λ/4
Q. What is the relationship between the wavelength of light and the angle of diffraction in a grating? (2023)
  • A. Directly proportional
  • B. Inversely proportional
  • C. No relationship
  • D. Exponential relationship
Q. What is the relationship between the wavelength of light and the angle of diffraction in a single-slit experiment? (2023)
  • A. Directly proportional
  • B. Inversely proportional
  • C. No relationship
  • D. Exponential relationship
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