Thanks for the info Madge..
What type of mount and tripod is it on?
Alt/az - fixed mount, swivel left/right up/down to point it.
or
Equatorial - moves in a fixed direction to follow the stars across the sky.
I'm guessing it's alt/az, but just want to make sure..
Can you take any pictures of it and post them?
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but can someone please tell me what the purpose of the optical tube is
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What do you mean? The refracting telescope is built inside a long tube.. it has a lens at one end and an eyepiece at the other.. The tube is long because of the focal length of the lens.
It should have a smaller tube as well, called a "finderscope" which attaches to the top of your main tube. It's basically just a smaller telescope with less magnification, which helps you "find" (hence the name) the object at low magnification before looking through the eyepiece at the higher magnification.
Does it come with eyepieces, or is it a plain spotting scope?
Maybe the 3090 means 30x magnification and a 90mm lens? I'll try and find some specs or pictures on the 'net..