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Polarimeter

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1. What is polarisation of waves?

  • Amplifying the wave's amplitude in all directions
  • Reflecting the wave at a boundary
  • Restricting wave oscillations to one direction in the transverse plane
  • Converting a longitudinal wave into a transverse wave

2. What is a polarimeter?

  • A tool for generating unpolarized light
  • A device used to measure the angle of optical rotation caused by an optically active substance
  • An instrument that measures wave frequency
  • A device that magnifies polarized light

3. What is the plane of polarization?

  • A vertical surface parallel to the light beam
  • A horizontal surface reflecting light
  • The same as the plane of vibration
  • The plane perpendicular to the plane of vibration and containing the direction of propagation

4. What is a Nicol prism and its function?

  • A device that converts sound waves to light
  • A lens used to focus unpolarized light
  • A glass prism used to reflect light
  • An optical device based on double refraction, used to produce and analyze plane polarized light

5. What are o-rays and e-rays?

  • Both rays follow Snell’s law identically
  • E-rays are reflected, and O-rays are transmitted
  • O-rays are longitudinal and E-rays are transverse
  • O-rays obey normal refraction laws with vibrations perpendicular to the plane of incidence; E-rays do not and have vibrations parallel to it

6. What is specific rotation?

  • The angle of rotation of polarized light through a 1 dm tube of a 1 g/cm³ solution of an optically active substance
  • The angle of light reflection from a prism
  • The fixed angle light bends at any interface
  • The rate of wave oscillation per second

7. What is Malus's Law?

  • The intensity doubles when two polarisers are aligned
  • Light always travels in a straight line
  • The intensity is constant regardless of the angle
  • The transmitted intensity is proportional to the square of the cosine of the angle between the polariser and analyser axes

8. What is Brewster’s Law?

  • Light is always polarized after reflection
  • The reflection angle must be zero for polarization
  • Polarized light cannot be refracted
  • At a specific angle, reflected light is completely polarized when reflected and refracted rays are perpendicular