STANDARD Physics Diffraction MCQ Question
In a single slit diffraction experiment, the width of the slit is made double its original width. Then the central maximum of the diffraction pattern will become
narrower and fainter
narrower and brighter
broader and fainter
broader and brighter
Correct Answer
Detailed Explanation
The angular width of the central maximum is 2λ/a where a is the width of the slit. If the value of a is doubled, the angular width of the central maximum decreases to half its earlier value. This implies that the central maximum becomes much sharper. Furthermore if a is doubled, the intensity of the central maximum becomes four times. Thus the central maximum becomes much sharper and brighter.
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