MHT CET 202621 AprilMorning Shift
- Exam
- MHT CET
- Year
- 2026
- Date
- 21 April
- Shift
- Morning Shift
- Subject
- Physics
- Chapter
- Wave Optics
MHT CET 2026 · 21 April · Morning Shift · Physics · Wave Optics
The condition for observing Fraunhofer diffraction from a single...
The condition for observing Fraunhofer diffraction from a single slit is that the wavefront incident on a single slit must be
Options
- Aspherical.
- Bplane.
- Ccylindrical.
- Delliptical.
Correct answer
B. plane.
Step-by-step solution
In Fraunhofer diffraction, the source of light and the screen are effectively at an infinite distance from the diffracting slit.
As a result, the wavefronts of the light incident on the slit are plane wavefronts.
This is typically achieved by placing the light source at the focus of a convex lens, which converts the diverging spherical wavefronts into plane wavefronts before they strike the slit.
Thus, the incident wavefront must be plane.
Answer: plane.
As a result, the wavefronts of the light incident on the slit are plane wavefronts.
This is typically achieved by placing the light source at the focus of a convex lens, which converts the diverging spherical wavefronts into plane wavefronts before they strike the slit.
Thus, the incident wavefront must be plane.
Answer: plane.