Q148 / 180 · KCET 2011 · Physics

Consider the following statements in case of Young's double slit experiment. (1) A slit $S$ is necessary if we use an ordinary extended source of light. (2) A slit $S$ is not needed if we use an ordinary but well collimated beam of light. (3) A slit $S$ is not needed if we use a spatially coherent source of light. Which of the above statements are correct?

  • A
    (1), (2) and (3)
  • B
    (1) and (2)
  • C
    (2) and (3)
  • Correct answer
    D
    (1) and (3)

Solution

In the case of Young's double slit experiment. A slit $S$ is necessary if we use an ordinary extended source of light and $A$ slit $S$ is not needed if we use a spatially coherent source of light.

Hence, the correct answer is option: 'D'.

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