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What will the magnification be?

What will the magnification be?
What will the magnification be?
What will the magnification be?

A stamp collector uses a magnifying glass w/ a focal length of 10 cm. In order to examine a rare postage stamp, he holds the lens 4.0 cm from his eyes. If the distance for the most comfortable viewing of the image is 30 cm from his eyes, how far from the lens must the postage stamp be placed? What will the magnification be?

u = object distance
m = magnification
Real is Positive sign convention.

1 / u - 1 / (30 - 4) = 1 / 10
u = 7.2 cm.

m = 26 / 7.2
= 3.6.



This entry was posted on Wednesday, September 1st, 2010 at 11:57 am and is filed under Stamps-01-01. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.

One Response to “What will the magnification be?”

  1. Beverley Says:
    Posted on September 4th, 2010 at 8:07 am

    The equation 722 cm substitute in the lens so the lens so the eyes or 26 cm from the equation 722 cm substitute in the eyes virtual 10 cm substitute in the equation 722.
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    The eyes virtual image is at distance of 722 cm from the eyes magnification vu 26722 36 hope this helps your_guide123yahoocom.
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