a) An object is placed 40.0cm in front of a diverging lens with a focal length of 19.2 cm. Please provide your answers in units of cm if necessary.  Find the image distance. I answered this part and I got -13 as an answer.   But i can't solve this second part:   b) Suppose the object is brought to a distance of 11.7 cm in front of the lens. Where is the image now with respect to its previous location? (Note: Ensure the sign convention you use is consistent by treating all image distances on the object side of the lens as negative.) c)How has the height of the image changed if the object is 80.7 cm tall?   plz help me answer it. thanks

College Physics
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ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
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Chapter1: Units, Trigonometry. And Vectors
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a) An object is placed 40.0cm in front of a diverging lens with a focal length of 19.2 cm. Please provide your answers in units of cm if necessary. 
Find the image distance. I answered this part and I got -13 as an answer.
 
But i can't solve this second part:
 
b) Suppose the object is brought to a distance of 11.7 cm in front of the lens. Where is the image now with respect to its previous location? (Note: Ensure the sign convention you use is consistent by treating all image distances on the object side of the lens as negative.)
c)How has the height of the image changed if the object is 80.7 cm tall?
 
plz help me answer it. thanks
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