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What is the principle behind the operation of a polarimeter?

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Question: What is the principle behind the operation of a polarimeter?

Options:

  1. Measuring the speed of light
  2. Determining the wavelength of light
  3. Measuring the rotation of polarized light
  4. Calculating the intensity of light

Correct Answer: Measuring the rotation of polarized light

Solution: 

A polarimeter measures the angle of rotation of polarized light as it passes through a sample, which can indicate the concentration of optically active substances.

What is the principle behind the operation of a polarimeter?

Practice Questions

Q1
What is the principle behind the operation of a polarimeter?
  1. Measuring the speed of light
  2. Determining the wavelength of light
  3. Measuring the rotation of polarized light
  4. Calculating the intensity of light

Questions & Step-by-Step Solutions

What is the principle behind the operation of a polarimeter?
  • Step 1: Understand that light can be polarized, meaning it vibrates in a specific direction.
  • Step 2: Know that a polarimeter is a device that measures how much this polarized light is rotated when it passes through a sample.
  • Step 3: Recognize that some substances can change the direction of polarized light; these are called optically active substances.
  • Step 4: The polarimeter has a light source that produces polarized light, which then goes through the sample.
  • Step 5: After passing through the sample, the light is analyzed to see how much its direction has changed.
  • Step 6: The amount of rotation is measured in degrees, which can help determine the concentration of the optically active substance in the sample.
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