MHT CET Medical202621 April 2026Evening ShiftPhysicsWave OpticsActual
In a single slit diffraction pattern, identify the incorrect statement from the following
Options
- AThe fringes have unequal width.
- BThe fringes have unequal intensity.
- CThe fringes have unequal width and unequal intensity.
- DThe fringes have equal width and equal intensity.
Correct answer
D. The fringes have equal width and equal intensity.
Step-by-step solution
In a single slit diffraction pattern, the central maximum has an angular width of 2 a , whereas the secondary maxima have an angular width of a . Thus, the fringes have unequal widths. The intensity of the central maximum is maximum, and the intensity of the successive secondary maxima decreases rapidly (approximately I₀ 22 , I₀ 61 , etc.). Thus, the fringes have unequal intensities. Therefore, the statement that the fringes have equal width and equal intensity is incorrect. Answer: The fringes have equal width and