Question based on Lenses -O level/gcse

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Homework Help Overview

The discussion revolves around a question related to lenses, specifically focusing on the application of the thin lens equation and the concept of magnification in the context of O level/GCSE physics.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the application of the thin lens equation and the definition of magnification. There is uncertainty regarding the length of the image taken in the solution, with one participant questioning why it is set at 50 while agreeing on the object's length being 20. Another participant suggests using a scale drawing to determine the image location.

Discussion Status

The discussion is ongoing, with participants exploring different aspects of the problem. Some guidance has been offered regarding the use of the thin lens equation and the drawing of light rays, but no consensus has been reached on the specific values used in the solution.

Contextual Notes

Participants are working within the constraints of a homework problem, which may limit the information available for discussion. The definitions and assumptions related to magnification and image formation are under scrutiny.

Wasif Shah
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New poster has been reminded to post schoolwork-type questions in the HH fourms and to use the Template
Hey can anyone explain this question to me?
 

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Wasif Shah said:
Hey can anyone explain this question to me?

Have you tried applying the thin lens equation? Hint: what's the definition of magnification?
 
yeaah i tried using magnification=image/object ratio thing. But idk why in the solution they have taken the length of image as 50. I agree with taking 20 as the length of object but i don't get the taking 50 as the length of image.
 
The location of the image is deterimined by drawing three special light rays from the object through the lens.
How should such rays be drawn?
Have you tried constructing such a drawing by say using a scale of 1 cm in the drawing is 2 cm in real life?
 
Last edited:

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