How Far Are You From This Lens?

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Homework Help Overview

The problem involves a lens that projects an image of a person onto a wall, with specific details about the image's height and distance from the lens. The questions raised include determining the distance from the lens, the nature of the image (erect or inverted), the focal length of the lens, and whether the lens is converging or diverging.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the type of lens that produces a real magnified image and the relationship between object distance, image distance, and magnification. Some express confusion about their calculations and seek assistance with specific parts of the problem.

Discussion Status

The discussion includes attempts to clarify the relationships involved in lens optics, with some participants offering formulas and insights about image distance and magnification. There is acknowledgment of misunderstandings regarding the problem, but no consensus has been reached on the solution.

Contextual Notes

Participants note the absence of specific homework equations in the original post, which may influence their approaches. There is also a mention of the need for clarity regarding the nature of the image being discussed.

binhnguyent9
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Homework Statement


You are standing in front of a lens that projects an image of you onto a wall 2.80 {\rm m} on the other side of the lens. This image is three times your height.
How far are you from the lens?
Is your image erect or inverted?
What is the focal length of the lens?
Is the lens converging or diverging?

Homework Equations



none

The Attempt at a Solution


none

thanks a lot for your help
 
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Which lens produces real magnified image?
What is the realtion between the objectg distsnce, image distance and magnification?
 


well the convex len can produce a real image, and m=-image distance/ object distance. i have try everything, and i don't know why it keep tell me i am wrong, if you don't mind can you do one of the part, then i can check it? thanks a lot for your help
 


Image distance is given. Magnification is given. Find the object distance.
Use the formula
1/do + 1/di = 1/f
For real image di is +ve.
And for virtual image di is -ve.
 


oh ok, thanks a lot. i think i misread the question first. thanks so much for your help
 

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