How to Solve IGCSE Lens q with Unspecified Distance

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SUMMARY

The discussion focuses on solving an IGCSE physics problem involving a converging lens with a focal length of 2.8 cm and a parallel light beam with a width of 1.0 cm. Participants emphasize the importance of sketching the diagram to visualize the problem, despite the unspecified distance from the beam to the lens. The primary goal is to determine the distances on the other side of the lens where the beam width changes. Forum rules require users to demonstrate their problem-solving approach for effective assistance.

PREREQUISITES
  • Understanding of lens optics, specifically converging lenses
  • Familiarity with the concept of focal length in optics
  • Ability to interpret and create sketch diagrams for physics problems
  • Knowledge of IGCSE physics problem-solving techniques
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  • Research the principles of lens optics and ray diagrams
  • Study the effects of varying object distances on image formation
  • Learn how to apply the lens formula: 1/f = 1/d_o + 1/d_i
  • Explore common IGCSE physics problems involving lenses and light beams
USEFUL FOR

This discussion is beneficial for IGCSE physics students, educators, and anyone seeking to enhance their understanding of lens behavior and problem-solving in optics.

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
 
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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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