Calculating magnification for Converging lens....

[johnwandering]

I am quite confused how to do this, because of sign conventions.


When an object s is on the left side of the lens, it is designated as positive.
When an image s' is REAL, it is designated as positive.

this would bring our magnification to
m=s'/s, which is a positive value.

But for converging lens, m should be a negative number.......

m=h'/h

Because h' is inverted, it should be a negative value... making m a negative value as well. But that would make our first equation impossible.


What's up with this?

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[EnginrTheFuture]

I am quite confused how to do this, because of sign conventions.


When an object s is on the left side of the lens, it is designated as positive.
When an image s' is REAL, it is designated as positive.

this would bring our magnification to
m=s'/s, which is a positive value.

But for converging lens, m should be a negative number.......

m=h'/h

Because h' is inverted, it should be a negative value... making m a negative value as well. But that would make our first equation impossible.


What's up with this?

There's quite the important negative sign missing in there