oh come on that you dont understand what i say doesnt mean i dont make sense
ill be honest as typical:
what i think is that to focus the sun right with a lens and obtain focal lenght it doesnt need to be the smallest spot but a circle of the right size
but this contradicts this info i got from the net:
In practical terms, and using the example with the magnifying glass mentioned above, the focal length of the magnifying glass would be the distance between the magnifying glass itself and the piece of paper when the image of the sun (the little patch of light) is smallest.
also theres the fact i have certain degree of control over my eye lens due to my training
and however i shape my eye lens its imposible for me to make a big dim light into a spot just make it bigger and blurred than it is but never smaller
edit:
yep when you concentrate light with a magnifying glass, when not directly observed, it behaves as waves, when you want to make out whats out there as particles:
as you can see when reality directly observed light follows straight lines projection rules
when not directly observed wave projection rules