Thin Lens And Lens Maker Equations Video Lessons

Concept

# Problem: A 4.0-cm-tall candle flame is 2.0 m from a wall. You happen to have a lens with a focal length of 42cm.A) How many places can you put the lens to form a well-focused image of the candle flame on the wall? Answer: 2B) What are the distance between the candle and the lens for each location? Answer: 60 and 140 cmC) For each location, what is the height of the image?

###### FREE Expert Solution

Lens equation:
$\overline{)\frac{\mathbf{1}}{{\mathbit{s}}_{\mathbit{o}}}{\mathbf{+}}\frac{\mathbf{1}}{{\mathbit{s}}_{\mathbit{i}}}{\mathbf{=}}\frac{\mathbf{1}}{\mathbit{f}}}$

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###### Problem Details

A 4.0-cm-tall candle flame is 2.0 m from a wall. You happen to have a lens with a focal length of 42cm.

A) How many places can you put the lens to form a well-focused image of the candle flame on the wall? Answer: 2

B) What are the distance between the candle and the lens for each location? Answer: 60 and 140 cm

C) For each location, what is the height of the image?