difference between the objective lens of a microscope and that of a telescope?
bigK asked:
so what’s the difference between the objective lens of a microscope and a telescope. for each do you want the object in front or behind each lens. which is a bigger focal length better for, and what kind of image is formed for each?
This entry was posted
on Wednesday, March 18th, 2009 at 12:00 am and is filed under Physics.
You can follow any responses to this entry through the RSS 2.0 feed.
You can leave a response, or trackback from your own site.
so what’s the difference between the objective lens of a microscope and a telescope. for each do you want the object in front or behind each lens. which is a bigger focal length better for, and what kind of image is formed for each?
March 19th, 2009 at 8:43 pm
First I have to ask you if it is a reflecting telescope or an astronomical telescope. Fot the reflecting telescope, it is a mirror , for the astronomical telescope, the objective is a converging lens. I presume that your question is for a astronomical telescope. Soo.
The difference is in the focal lenght..
The objective of a telescope has a very long focal lenght, over 1meter, 2 meters and more.
the focal lenght of a microscope is very small, less than .01m
The object is always in front of the lens for both, for the telescope the object is at infinity . For the microscope the object is near the focus.
Both lens produce real images, inverted, . These real image become object for the eyepiece and are situated inside the focus of the eyepiece.The final image is then virtual and may be seen only if you look inside the eyepiece..
good luck
P.A.