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Question 20249
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Electromagnetic Waves and Wave Optics: Polarisation — Application MCQ

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Polarisation — ApplicationEasyQuestion 20249

Question

Optical activity means a substance can:
  1. A
    Generate light
  2. B
    Rotate the plane of polarisation of transmitted light
    Correct
  3. C
    Block all polarised light
  4. D
    Increase intensity of polarised light

Correct answer

Rotate the plane of polarisation of transmitted light

Explanation

Optically active substances (sugars, amino acids) rotate the plane of plane-polarised light. Dextrorotatory (+) rotates clockwise, levorotatory (−) anticlockwise. Used in saccharimetry to determine sugar concentration.

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