Question based on Lenses -O level/gcse

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The discussion revolves around understanding the application of the thin lens equation and the concept of magnification in optics. Participants are clarifying the reasoning behind using specific lengths for the image and object in calculations, particularly why the image length is taken as 50. There is a suggestion to visualize the problem by drawing special light rays from the object through the lens. Additionally, using a scale for drawing is proposed as a method to better understand the relationships involved. Overall, the focus is on grasping the principles of lens optics and accurate representation in calculations.
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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?
 
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