Camera Lens Magnification

  • #1

Homework Statement



A camera lens has focal length 55mm and an object is 500mm away. Calculate the position of the image and the magnification (or reduction)


Homework Equations



1/u + 1/v = 1/f

u = Object Distance

v = Image Distance

f = focal length

m = magnification

The Attempt at a Solution



f = 55

u = 500

1/500 + 1/v = 1/55

1/55 - 1/500 = 1/v

55-1 - 500 -1 = 0.01618

ANS-1 = 61.79 so approximately 62mm

v/u = m

62/500 = 0.124M

Did I go with the right approach? Any help would be great.
 

Answers and Replies

  • #2
907
88
Looks OK to me.

The only things I can think of is that the magnification M = -0.124

1) magnification is supposed to be -ve because the image is usually upside down after the light rays go through a lens provided the object is outside the focal length

2) 0.124M should just be 0.124 since it is a dimensionless number.
 

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