Multiple Lens System(Objectless and Parallel Rays)

  • Thread starter JohnGaltis
  • Start date
  • #1
JohnGaltis
18
0

Homework Statement


Consider a telescope composed of two convex lenses, the objective lens and the eyepiece. The objective lens has a focal length of 26cm. Rays parallel to the principle axis enter the telescope through the objective lens and exit the telescope from the eyepiece as parallel rays. If the distance between the two lens is 30cm, find the focal length of the eyepiece.

Homework Equations


1/f = 1/d(object) +1/d(image)

The Attempt at a Solution


I am used to solving questions where rays come from an object and plugging in values. When rays are parallel and doesn't converge, how do I solve such a question? How do I start?

I know the rays entering the objective lens will converge on the focal point(26cm) since they are parallel rays.

Is the focal length of the eyepiece 4cm? (30cm-26cm)
 

Answers and Replies

  • #2
BvU
Science Advisor
Homework Helper
15,067
4,117
Hello John, :welcome:

According to your relevant equation: yes.
Make a drawing to check this out !
 
  • #3
JohnGaltis
18
0
Ah- thank you, ByU.
 

Suggested for: Multiple Lens System(Objectless and Parallel Rays)

  • Last Post
Replies
3
Views
2K
Replies
0
Views
3K
  • Last Post
Replies
0
Views
1K
Replies
11
Views
2K
Replies
6
Views
2K
  • Last Post
Replies
3
Views
11K
Replies
28
Views
4K
Replies
1
Views
11K
Replies
9
Views
3K
  • Last Post
Replies
1
Views
1K
Top