A monochromatic light is incident on two slits and an interference pattern is produced on a screen at distance L. Now one slit is covered, and no light comes from it. What is the change in pattern on the screen?
Correct answer: D. Less number of fringes will be observed
- A. The width of central maximum is decreased
- B. The width of outer maximum is decreased
- C. The intensity of the central maximum will decrease
- D. Less number of fringes will be observed
Explanation
Option D is correct since there will be fewer fringes on the screen since one slit is covered and no light coming from it.
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About Superposition and Interference
Superposition states that overlapping waves produce a resultant displacement equal to the algebraic sum of their individual displacements. Interference covers constructive and destructive interference, phase difference, path difference, coherent sources, and conditions for maxima and minima. It differs from diffraction, which involves spreading around openings or obstacles.
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