Lenses- magnification adn focal length

AI Thread Summary
The discussion centers on the relationship between magnification and focal length in lenses, as a user seeks help with a physics assignment. The user conducted an experiment measuring magnification at various distances and calculated focal lengths but is unsure how to present the data. Key equations mentioned include 1/v - 1/u = 1/f for focal length and the magnification formula m = -di/do. Suggestions for graphing include plotting image distance (di) against object distance (do) and magnification (m) against object distance (do). The conversation emphasizes the need for clarity in understanding these concepts and how to effectively represent the findings.
PhysicsChick8
Messages
5
Reaction score
0

Homework Statement


Hey,,
I was wondering if anyone could help me with some physics work i am doing as i am completely stuck.
Is there supposed to be any relationship with the magnification and focal length of lenses and if so what is it?
I did an experiment and measure the magnification of lenses different distances from the lenses and also calculated the focal length at these points. Now i am stuck on how to write all this up and what graphs to draw.
Any help would be much appreciated :s
xxx


Homework Equations



I used 1/v-1/u=1/f for focal length
and size of image/ size of object for magnification

The Attempt at a Solution

 
Physics news on Phys.org
Welcome to PF!

Hi PhysicsChick8! Welcome to PF! :smile:

See the PF Library entry on lens :wink:​
 
thanks i read that but I'm kinda very bad at physics and need it explained in very simple terms if possible without too many confusing equations xx
 
As the Library says …

The image is magnified (with respect to the size of the object) by the factor m = -di/do

and …

do is positive for a real object and negative for a virtual object (See Images section).
di is positive for a real image and negative for a virtual image (See Images section).

and …

For the common situation where the object and image are real (do and di both positive), the magnification is negative indicating an inverted image with respect to the object.
 
so if i were plotting stuff on a graph what would i plot? x
 
Well, what are you trying to show? :smile:
 
thats the problem i don't know,,, we had to choose an experiment and i choose the magnification and power of lenses as it seemed easy. Now i have to write it up and draw graphs but I am not sure what of as i don't really know what is linked. I really am useless at this if you haven't guessed already x
 
I suppose the obvious graphs would be di against do, and m (= -di/do) against do.

Try drawing them, and see what you get. :smile:
 
thank you :D x
 

Similar threads

Find the location and length of the final image
Replies
2
Views
836
Focal length of the eyepiece lens in a compound microscope
Replies
7
Views
1K
How to measure the magnification of a microscope in the lab
Replies
12
Views
3K
I Total focal length and magnification
Replies
4
Views
2K
Understanding Two Convex Lenses: Ray Diagram and Focal Lengths
Replies
3
Views
2K
System of lenses with a light source at first focal point
Replies
16
Views
2K
Wave Physics - Optics - Effective Focal Length
Replies
12
Views
4K
What Focal Length Eyepiece Provides a -125 Magnification?
Replies
1
Views
2K
Why Do Microscopes Use Magnification Labels and Vision Correction Uses Diopters?
Replies
1
Views
2K
Inserting thick lenses into a thin lens system and deducing values
Replies
1
Views
2K

Hot Threads

Recent Insights

Back
Top