If a green light in a Young double slit experiment is replaced by monochromatic orange light of the same intensity, Then:
Correct answer: B. Fringe width will increase
- A. Fringe width will decrease
- B. Fringe width will increase
- C. Fringe width will remain the same
- D. Fringe width will become less intense
Explanation
Fringe width will increase: If the orange light has a longer wavelength compared to the green light, then the fringe width will increase. In this case, the fringes become more spread out, resulting in a wider fringe pattern. This occurs because the fringe width is inversely proportional to the wavelength of light.
This question appeared on the ETEA MDCAT 2009 paper, which you can sit online with every answer explained.
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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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