A parallel beam of monochromatic light is incident normally on a slit. The diffraction pattern is observed on a screen placed at the focal plane of a convex lens. If the slit width is increased, the central maximum of the diffraction pattern will
Show Hint
- become broader and fainter
- become broader and brighter
- become narrower and fainter
- become narrower and brighter
The Correct Option is D
Solution and Explanation
Width of central maximum $\beta = \frac{2D\lambda}{d}$, where $d$ is slit width.
Step 2: Detailed Explanation:
As $d$ increases, $\beta$ decreases (narrower). Also, the intensity increases because more light passes through the wider slit.
Step 3: Final Answer:
The central maximum becomes narrower and brighter.
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