Optics

Q. If the refractive index of a medium is greater than 1, what happens to the wavelength of light in that medium compared to its wavelength in vacuum?
  • A. It increases
  • B. It decreases
  • C. It remains the same
  • D. It becomes zero
Q. If the refractive index of a medium is greater than 1, what happens to the wavelength of light in that medium?
  • A. It increases
  • B. It decreases
  • C. It remains the same
  • D. It becomes zero
Q. If the refractive index of a thin film is greater than that of the surrounding medium, what happens to the phase of the reflected wave?
  • A. No phase change
  • B. Phase change of π
  • C. Phase change of 2π
  • D. Phase change of λ/2
Q. If the refractive index of diamond is 2.42, what is the critical angle for total internal reflection when light travels from diamond to air?
  • A. 24.4°
  • B. 30.0°
  • C. 36.9°
  • D. 41.8°
Q. If the slit width is equal to the wavelength of light used, what is the expected diffraction pattern?
  • A. No diffraction
  • B. Single maximum
  • C. Wide central maximum
  • D. Narrow central maximum
Q. If the slit width is halved in a single-slit diffraction experiment, what happens to the angular width of the central maximum?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. If the slit width is halved in a single-slit diffraction experiment, what happens to the width of the central maximum?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. If the speed of light in vacuum is 3 x 10^8 m/s, what is the speed of light in a medium with a refractive index of 1.5?
  • A. 2 x 10^8 m/s
  • B. 2.5 x 10^8 m/s
  • C. 3 x 10^8 m/s
  • D. 1.5 x 10^8 m/s
Q. If the wavelength of light in a vacuum is 600 nm, what is its wavelength in glass (n = 1.5)?
  • A. 400 nm
  • B. 600 nm
  • C. 900 nm
  • D. 300 nm
Q. If the wavelength of light in air is 600 nm, what is its wavelength in glass (n=1.5)?
  • A. 400 nm
  • B. 450 nm
  • C. 600 nm
  • D. 900 nm
Q. If the wavelength of light is halved, what happens to the frequency of the light?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. If the wavelength of light used in a diffraction experiment is halved, what happens to the position of the minima?
  • A. They move closer together
  • B. They move further apart
  • C. They remain unchanged
  • D. They disappear
Q. If the wavelength of light used in a diffraction experiment is halved, what happens to the angular position of the first minimum in a single-slit diffraction pattern?
  • A. It remains the same
  • B. It doubles
  • C. It halves
  • D. It quadruples
Q. If the wavelength of light used in a diffraction experiment is halved, what happens to the position of the first diffraction minimum?
  • A. It moves closer to the center
  • B. It moves further from the center
  • C. It remains unchanged
  • D. It disappears
Q. If the wavelength of light used in a diffraction experiment is increased, what happens to the diffraction pattern?
  • A. It becomes sharper
  • B. It becomes broader
  • C. It remains unchanged
  • D. It disappears
Q. If the wavelength of light used in a double-slit experiment is 600 nm and the distance between the slits is 0.3 mm, what is the distance between the first and second bright fringes on the screen placed 2 m away?
  • A. 0.4 m
  • B. 0.6 m
  • C. 0.8 m
  • D. 0.2 m
Q. If the wavelength of light used in a double-slit experiment is increased, what happens to the position of the interference fringes?
  • A. Fringes move closer together
  • B. Fringes move further apart
  • C. Fringes disappear
  • D. Fringes become brighter
Q. If the wavelength of light used in an interference experiment is 500 nm, what is the fringe separation when the screen is placed 2 m away from the slits separated by 0.1 mm?
  • A. 0.01 m
  • B. 0.025 m
  • C. 0.05 m
  • D. 0.1 m
Q. If the wavelength of light used in Young's experiment is 600 nm and the distance between the slits is 0.1 mm, what is the distance between the first and second bright fringes on a screen 2 m away?
  • A. 0.12 m
  • B. 0.24 m
  • C. 0.36 m
  • D. 0.48 m
Q. If the wavelength of light used in Young's experiment is 600 nm, what is the fringe width when the distance between the slits is 0.1 mm and the distance to the screen is 2 m?
  • A. 0.03 mm
  • B. 0.06 mm
  • C. 0.12 mm
  • D. 0.15 mm
Q. If two coherent sources of light are in phase, what type of interference pattern will be observed?
  • A. No interference pattern
  • B. Destructive interference
  • C. Constructive interference
  • D. Random interference
Q. If two coherent sources of light are in phase, what type of interference will occur?
  • A. Destructive interference
  • B. Constructive interference
  • C. No interference
  • D. Random interference
Q. If two coherent sources of light are in phase, what will be the phase difference at a point where the path difference is λ/2?
  • A. 0 radians
  • B. π/2 radians
  • C. π radians
  • D. 2π radians
Q. If two coherent sources of light are in phase, what will be the phase difference at a point where the path difference is λ/4?
  • A. 0 radians
  • B. π/2 radians
  • C. π radians
  • D. 3π/2 radians
Q. If two coherent sources of light are in phase, what will be the result at a point where the path difference is λ/2?
  • A. Constructive interference
  • B. Destructive interference
  • C. No interference
  • D. Partial interference
Q. If two polarizers are oriented at 90 degrees to each other, what will be the intensity of light passing through them?
  • A. Maximum intensity
  • B. Half of the original intensity
  • C. Zero intensity
  • D. The same as the first polarizer
Q. If two polarizers are placed at 90 degrees to each other, what will be the intensity of light passing through them?
  • A. Equal to the intensity of the first polarizer
  • B. Half of the intensity of the first polarizer
  • C. Zero
  • D. Equal to the intensity of the second polarizer
Q. If two polarizers are placed in series with their axes at 90 degrees to each other, what will be the intensity of light passing through?
  • A. It will be maximum
  • B. It will be minimum
  • C. It will be half of the original intensity
  • D. It will be one-fourth of the original intensity
Q. If two waves have a phase difference of π radians, what type of interference occurs?
  • A. Constructive interference
  • B. Destructive interference
  • C. No interference
  • D. Complete interference
Q. If two waves interfere constructively, what is the condition for the path difference?
  • A. (n + 1/2)λ
  • B.
  • C. (n - 1/2)λ
  • D. n/2 λ
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