Discussion
What geometric property makes a paraboloid focus a plane wave to a point?
Answer: B
The defining property is that the total path from a plane across the aperture to the surface and on to the focus is constant, so all contributions arrive in phase. Equal angles of reflection are true of any mirror and explain nothing particular about the paraboloid, the curvature relationship stated is not the criterion, and the centre of curvature of a paraboloid is not its focus. Recognising that focusing is a statement about equal path lengths makes the extension to shaped and dual reflector systems straightforward.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development