Question:
In a single slit diffraction pattern, identify the incorrect statement from the following
In a single slit diffraction pattern, identify the incorrect statement from the following
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In single-slit diffraction the central maximum is the widest and brightest, and the secondary maxima fade quickly.
Updated On: Nov 12, 2026
- The fringes have unequal width.
- The fringes have unequal intensity.
- The fringes have unequal width and unequal intensity.
- The fringes have equal width and equal intensity.
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
In a single-slit pattern the central bright band is about twice as wide as each secondary band, so the widths are unequal.
Step 2: Intensity
The central maximum is much brighter than the secondary maxima, and the intensity keeps falling for higher orders. So the intensities are unequal.
Step 3: Compare the options
Statements A, B and C say that the widths or intensities are unequal, and they are correct. The incorrect statement is D, which says that the fringes have equal width and equal intensity.
Final Answer:
The incorrect statement is that the fringes have equal width and equal intensity. \[ \boxed{\text{(D) }\text{The fringes have equal width and equal intensity.}} \]
In a single-slit pattern the central bright band is about twice as wide as each secondary band, so the widths are unequal.
Step 2: Intensity
The central maximum is much brighter than the secondary maxima, and the intensity keeps falling for higher orders. So the intensities are unequal.
Step 3: Compare the options
Statements A, B and C say that the widths or intensities are unequal, and they are correct. The incorrect statement is D, which says that the fringes have equal width and equal intensity.
Final Answer:
The incorrect statement is that the fringes have equal width and equal intensity. \[ \boxed{\text{(D) }\text{The fringes have equal width and equal intensity.}} \]
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