The Lenses

EsX_Raptor

United States2801 Posts

November 19 2009 04:33 GMT

Amazing how those things led us to many new discoveries/observations in both very far away objects and really, really close ones.

Ok, tomorrow we have a quiz on how a microscope, telescope and camera (lenses and mirrors) work together to give us those images.

I already know how a reflector telescope works:

Sorry for the sloppy drawing, here the yellow lines represent the light coming into the telescope.

But I'm not quite sure yet how a microscope (a really simple one, probably just using two lenses) works

I'll theorycraft a bit with some drawings of lenses with their focal points and incoming light rays.

andiCR

Costa Rica2273 Posts

November 19 2009 04:59 GMT

google is your friend

http://www.google.co.cr/search?q=how microscopes work&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a

meeple

Canada10211 Posts

November 19 2009 05:01 GMT

Thats not how a normal light microscope works... he wants a pinhole one... with the light source at the bottom...

meeple

Canada10211 Posts

November 19 2009 05:02 GMT

Like this:

EsX_Raptor

United States2801 Posts

November 19 2009 05:12 GMT

it's not about the microscope itself, but more about the lenses =)

this is what i have so far:

but i have some problems =(

here blue is the object and red is the image

edit: here i'm just using the fact that rays parallel with the main axis bend towards the focus point and rays passing through the focus point bend parallel to the main axis. and yes, both lenses here have one of their focus points together.

skyglow1

New Zealand3962 Posts

November 19 2009 06:31 GMT

Rays that don't cross means you won't get a real image. Instead, you'll get a virtual image, that is at the position from which those 2 diverging rays appear to be coming from. So backtrack those 2 diverging rays, see where they cross, and that's where your magnified virtual image will be. If you're still confused:

http://physics.2lv.in/blog/sites/default/files/microscope.GIF
http://physics.bgsu.edu/~stoner/P202/device/img016.JPG

EsX_Raptor

United States2801 Posts

November 19 2009 06:39 GMT

you fucking own skyglow

props my man!

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