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## Homework Statement

A biology student wishes to examine a bug at a magnificaiton of +5.00 by looking through a single lens. the student wants the image of the bug to be a distance of 25cm from the lens. what is the focal length of the lens?

Answer:+6.25cm

## Homework Equations

m=-d(image)/d(object)

1/f=[itex]\frac{1}{d(object)}[/itex]+[itex]\frac{1}{d(image)}[/itex]

## The Attempt at a Solution

first i solve for distance of object, d(object), by using the first equation:

d(object) = (25x10

^{-2})/5

then i calculated focal length by using the second equation

f = ((1/0.5) + (1/0.25))

^{-1}= 0.041667

i dont know what im doing wrong