Converging Lens Magnification Problem

  • Thread starter soccerjayl
  • Start date
  • #1
53
0
What am I missing here?

A person looks at a gem using a converging lens with a focal length of 15.0 cm. The lens forms a virtual image 26.0 cm from the lens. Determine the magnification.

(1/p)+(1/q) = (1/f)
p=?
q=26 cm
f=15 cm

(1/15)-(1/26)= Ans^-1 = 35.5 cm (p)

Magnification= -(q/p)
M= -(26/35.5)
M= -0.733

Answer [-.733] has been marked wrong. What did I do?
 

Answers and Replies

  • #2
Doc Al
Mentor
44,986
1,258
check your sign convention

soccerjayl said:
(1/p)+(1/q) = (1/f)
p=?
q=26 cm
f=15 cm
Your sign convention is incorrect. "q" for a virtual image is negative.

Welcome to PF, by the way.
 
  • #3
53
0
whoa thanks

i apologize, i knew that...just dumb tonight

thanks for the welcome
 

Related Threads on Converging Lens Magnification Problem

  • Last Post
Replies
1
Views
3K
  • Last Post
Replies
12
Views
3K
Replies
1
Views
7K
  • Last Post
Replies
1
Views
2K
Replies
1
Views
1K
  • Last Post
Replies
3
Views
924
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
3
Views
10K
  • Last Post
Replies
10
Views
2K
Top