- #1

Beth N

- 41

- 4

## Homework Statement

A 2.0-cm-tall candle flame is 2.0 m from a wall. You happen to have a lens with a focal length of 32 cm. How many places can you put the lens to form a well-focused image of the candle flame on the wall? For each location, what are the height and orientation of the image?

## Homework Equations

## \frac {1} {f} = \frac {1} {s'} + \frac {1} {s} ## Where s' is image distance, s is object distance, and f is focal length of the lens. The lens is converging because its focal length is positive.

## The Attempt at a Solution

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I just have a hard time approach in the question. I came up with a quadratic formula but still got wrong answer. Apologize for not writing this in Latex I am in quite a rush.

s'+s=2

s's=2/f=2/0.32=6.25

The answer key provided is s′=160 cm, h′=0.50 cm; s′=40 cm, h′=8.0 cm

Thank you so much!