Question

In Fraunhoffer diffraction the

• A. Source of light and the screen appear to be at infinite distance from the slit
• B. The wavefront’s involved in this case are plane
• C. Convex lenses are used to focus the diffraction fringes on the screen
• D. All the above

Answer 1

The correct option is D All the above

Yup, all are correct. Lenses are used on either side of the slit to mimic infinitely far source and screen, and to give planar wavefronts