Locate the position of the image.

[mba444]

Homework Statement

A diverging lens has a focal length of 15.7 cm.
An object 1.91 cm in height is placed 380 cm
in front of the lens.

Locate the position of the image. Answer
in units of cm.

Homework Equations

(1/f)= (1/p)+(1/i)

The Attempt at a Solution

1/[(1/-15.7)-(1/1.91)]= i , i = -1.70284
i solved this way but i keep on getting the wrong answer don't know why

 

[andrevdh]

o = 380 cm

 

[mba444]

what ?
i didnt get it

 

[andrevdh]

Sorry, you use a p, so p = 380 cm

 

[Fenn]

To clarify, you're using the object height when you should be using the object distance from the lens.