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Question: Answered & Verified by Expert
In a Young's double slit experiment, the separation between the two slits is $d$ and the wavelength of the light is $\lambda$. The intensity of light falling on slit 1 is four times the intensity of light falling on slit 2 . Choose the correct choice(s),
PhysicsWave OpticsJEE AdvancedJEE Advanced 2008 (Paper 1)
Options:
  • A
    If $d=\lambda$, the screen will contain only one maximum
  • B
    If $\lambda < d < 2 \lambda$, at least one more maximum (besides the central maximum) will be observed on the screen
  • C
    If the intensity of light falling on slit 1 is reduced so that it becomes equal to that of slit 2 , the intensities of the observed dark and bright fringes will increase
  • D
    If the intensity of light falling on slit 2 is increased so that it becomes equal to that of slit 1 , the intensities of the observed dark and bright fringes will increase
Solution:
2692 Upvotes Verified Answer
The correct answers are:
If $d=\lambda$, the screen will contain only one maximum
,
If $\lambda < d < 2 \lambda$, at least one more maximum (besides the central maximum) will be observed on the screen
For $d=\lambda$, there will be only one, acentral maxima.
For $\lambda < d < 2 \lambda$, there will be three maximas on the screen corresponding to path difference, $\Delta x=0$ and $\Delta x=\pm \lambda$ correct options are (a) and (b).

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