COMEDK · Physics · 26. Wave Optics
Two narrow parallel slits illuminated by a coherent monochromatic light produces an interference pattern on a screen
placed at a distance \(\mathrm{D}\) from the slits. The separation between the dark lines of the interference pattern can be increased by
- A decreasing the distance between the screen and the slits
- B using monochromatic light of higher frequency
- C using monochromatic light of a longer wavelength
- D increasing the distance between the slits
Answer & Solution
Correct Answer
(C) using monochromatic light of a longer wavelength
Step-by-step Solution
Detailed explanation
The fringe width \(\beta\) in a Young's double slit experiment is given by the formula \(\beta = \dfrac{\lambda D}{d}\), where \(\lambda\) is the wavelength of the monochromatic light, \(D\) is the distance between the slits and the screen, and \(d\) is the separation between…
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