• Support PF! Buy your school textbooks, materials and every day products Here!

Geometrical Optics

  • Thread starter jst81161
  • Start date
  • #1
10
0

Homework Statement



Explain why for a given object screen distance there are two positions where the image is in focus. Is this always true?

Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
berkeman
Mentor
56,647
6,546
Two positions of what, the lens? What kind of lens? What is the background for this question? What are the relevant equations?
 

Related Threads for: Geometrical Optics

  • Last Post
Replies
2
Views
542
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
12
Views
8K
  • Last Post
Replies
3
Views
957
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
6
Views
611
  • Last Post
Replies
4
Views
1K
  • Last Post
Replies
4
Views
4K
Top