Optics(General Knowledge > General Science ) Questions and Answers

Question 1. Optics is the study of
  1.    human eyesight
  2.    the properties of light
  3.    how light behaves when it hits different surfaces
  4.    telescopes
Explanation:-
Answer: Option B. -> the properties of light
Question 2. What is optics?
  1.    The study of rainbows
  2.    The study of light and its properties
  3.    The study of the human eye
  4.    The study of telescopes
Explanation:-
Answer: Option B. -> The study of light and its properties
Question 3. Which of the following phenomena is used in optical fibres?
  1.    Total internal reflection
  2.    Scattering
  3.    Diffraction
  4.    Refraction
Explanation:-
Answer: Option A. -> Total internal reflection
Question 4. Optically active substances are those substances which
  1.    produces polarised light
  2.    produces double refraction
  3.    rotate the plane of polarization of polarised light
  4.    converts a plane polarised light into circularly polarised light.
Explanation:-
Answer: Option C. -> rotate the plane of polarization of polarised light
Question 5. Fermat's principle states that:
  1.    The path taken by a light ray is always the shortest.
  2.    The path taken by a light ray is the one for which the optical path length is a maximum.
  3.    The path a light ray takes maximizes its time of travel between any two points.
  4.    The path taken by a light ray always minimizes the time between any two points.
Explanation:-
Answer: Option D. -> The path taken by a light ray always minimizes the time between any two points.
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