Lenses- magnification adn focal length

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Homework Help Overview

The discussion revolves around the relationship between magnification and focal length in lenses. The original poster is seeking assistance with their physics homework, specifically regarding the analysis and presentation of experimental data related to these concepts.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to understand the relationship between magnification and focal length, having conducted an experiment measuring these variables. They express uncertainty about how to present their findings and what graphs to create. Participants suggest exploring specific graph relationships, such as image distance versus object distance and magnification versus object distance.

Discussion Status

Contextual Notes

The original poster mentions feeling overwhelmed by the physics concepts and seeks explanations in simpler terms. There is a sense of uncertainty regarding the connections between the measured variables and how to represent them graphically.

PhysicsChick8
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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
 

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