Concave Mirror and objects distance

  • Thread starter sheri1987
  • Start date
  • #1
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Homework Statement


A concave mirror (f = 44 cm) produces an image whose distance from the mirror is one-fourth the object distance.

(a) Determine the object distance.
cm

(b) Determine the (positive) image distance.
cm



Homework Equations



1/do +1/di =1/f do=object distance and di=image distance


The Attempt at a Solution



Since there are two unknowns I thought I could change the equation to 1/do + 1/4do = 1/f....and solve but this wasn't turning out right? am I going about this the wrong way?
 

Answers and Replies

  • #2
468
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Is 1/4do equal to (1/4)do or 1/(4do)? In any case, if the image distance is one-fourth the object distance, does that mean that di = 4do?
 

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