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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Single slit diffraction is different from ideal interference.
Its fringes are not equal in both width and intensity.
Updated On: May 14, 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
Concept:
In single slit diffraction:
• central maximum is wider than the secondary maxima,
• intensity decreases away from the centre. e} ip
Step 1: Recall fringe width property.
The central bright fringe is the widest. The secondary bright fringes are narrower. So widths are not all equal. ip
Step 2: Recall intensity property.
The central maximum has highest intensity. Secondary maxima have lower and decreasing intensities. So intensities are not all equal. ip
Step 3: Identify the incorrect statement.
The statement saying “equal width and equal intensity” is incorrect. ip Hence, the correct answer is:
\[ \boxed{(D)\ \text{The fringes have equal width and equal intensity}} \]
In single slit diffraction:
• central maximum is wider than the secondary maxima,
• intensity decreases away from the centre. e} ip
Step 1: Recall fringe width property.
The central bright fringe is the widest. The secondary bright fringes are narrower. So widths are not all equal. ip
Step 2: Recall intensity property.
The central maximum has highest intensity. Secondary maxima have lower and decreasing intensities. So intensities are not all equal. ip
Step 3: Identify the incorrect statement.
The statement saying “equal width and equal intensity” is incorrect. ip Hence, the correct answer is:
\[ \boxed{(D)\ \text{The fringes have equal width and equal intensity}} \]
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