Ray Tracing for Convex Lens: How to Determine Image Distance and Realness

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Homework Help Overview

The discussion revolves around ray tracing for a convex lens, specifically focusing on determining the image distance and whether the image is real or virtual. The problem involves applying the lens equation and understanding the behavior of light rays as they pass through the lens.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the characteristics of the image formed by the lens, including its realness or virtuality. There are attempts to apply the lens equation to find the image distance, with some participants expressing uncertainty about their ray tracing skills and the implications of different scenarios.

Discussion Status

Some participants have provided guidance on ray tracing techniques, affirming the correctness of certain approaches. There is a mix of confidence levels among participants, with some feeling more assured after receiving feedback, while others continue to question their understanding of the concepts involved.

Contextual Notes

Participants are working within the constraints of a homework assignment, which may limit the information they can share or the depth of their discussions. There is an emphasis on understanding the underlying principles rather than simply applying formulas.

toothpaste666
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Homework Statement

lensquestion.png
[/B]
B) Is the image real or virtual? Explain.
C) Using the lens equation, find the image distance.

2. Homework Equations

1/di + 1/do = 1/f

The Attempt at a Solution


A)
lens.png

B) The image is real because it is on the opposite side of the lens as the source of light.

C) do = 6cm f = 3cm
1/do + 1/di = 1/f
1/di = 1/f - 1/do
1/di = do/f(do) - f/f(do)
1/di = (do-f)/(f*do)
di = (f*do)/(do-f) = (3cm * 6cm)/(6cm - 3cm) = (18cm^2)/(3cm) = 6cm
di = 6cm
 
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not too confident about my ray tracing. this is what it shows in the book but i know it differs depending on the situation
 
toothpaste666 said:
not too confident about my ray tracing. this is what it shows in the book but i know it differs depending on the situation
Your ray tracing is all right. The ray entering parallel with the axis goes through the focus on the other side of the lens.
The ray entering through the focus, goes parallel with the axis on the other side.
 
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ok i feel a little more confident that i got both of these problems right. thanks for the help
 
you are welcome.:)
 

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