Re: virtual images and convex lenses

[Tim Forth <tim_forth@HOTMAIL.COM>]

> From: Bernard Cleyet <anngeorg@PACBELL.NET>

> In the above, the image plane is in the same place as way above.   Try
> this:
> (reverse of the first time)  place your eye as in your 2.  interpose the
> screen
> (translucent)  move it (along the optical axis) 'till you see the image
> on (in)
> the screen.

Thanks for the help.

I know that a real image is still formed some distance away from the lens,
but I am wondering about the image I can see _in_ the lens. That is, I can
see an upside down crystal clear image through the lens. Is this a real
image? Apparently not since it appears to be on the other side of the glass.
What causes this?

I don't have a copy of the book you are refering to, but I do have Hecht's
Optics. He doesn't seem to address this issue.

Same with the other situation. I know that I can see the real image in a
darkened room, why can't I see it superimposed on the background in a lit
room? I suppose it is washed out against the background? Why does a screen
help? Does it force my eyes to focus on the right plane? Maybe a manual
focus camera will make the situation more obvious.

Tim

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