How to Solve IGCSE Lens q with Unspecified Distance

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Homework Help Overview

The discussion revolves around a problem related to optics, specifically concerning a converging lens and a beam of parallel light. The original poster is uncertain about the placement of the object due to unspecified distance information in the problem statement.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the need for a sketch diagram and question how to determine the object's distance from the lens given the lack of specific information. There is a focus on interpreting the width of the beam and its implications for the distances on the other side of the lens.

Discussion Status

Some participants have reiterated the importance of the beam's width and its role in finding distances after the lens. Guidance has been offered regarding forum posting etiquette and the necessity of showing work for further assistance.

Contextual Notes

There are mentions of forum rules that require participants to demonstrate their thought process or work when seeking help. The problem specifies a focal length for the lens but lacks details on the object's distance.

S2100595
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Homework Statement
Could you please help me to figure out this question? The answer scheme says i) should be between 0 and 5.6 cm and ii) should be beyond 5.6 cm.
Relevant Equations
Not applicable
I know a sketch diagram is required for the question but they haven't specified the distance from the beam to the lens. They've just given the height of the beam. So how do I know how far I should place the object? Should the object (beam) be at infinity?
Screenshot (1877).png
 
Last edited:
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Read the problem. It clearly states that the width of the beam before it reaches the lens is 1.0 cm. So the question is to find the distance(s) on the other side of the lens where the beam is less or more than 1.0 cm. Should you require additional help, our rules require that you show some work or at least how you intend to answer this question.
 
kuruman said:
Read the problem. It clearly states that the width of the beam before it reaches the lens is 1.0 cm. So the question is to find the distance(s) on the other side of the lens where the beam is less or more than 1.0 cm. Should you require additional help, our rules require that you show some work or at least how you intend to answer this question.
I have re-written how I intend to solve it
 
S2100595 said:
I have re-written how I intend to solve it
Please don't edit your original post if you wish to reply. It could be confusing and is bad form. Start a new post. If you intend to draw a sketch, then draw one and post it. Mind the statement of the problem that says "A beam of parallel light strikes a converging lens of focal length 2.8 cm." What distance do you need to be given to draw a sketch of that?
 
Alright never mind. This is my first post and I didn't realize there are so many restrictions and rules about how I can post on this forum.
 

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