Archive for April, 2010

An astronomical telescope uses an objective lens of focal length?

Wednesday, April 28th, 2010 at 5:42 pm

An astronomical telescope uses an objective lens of focal length 15m and eye lens of focal length 1cm. What is angular magnification of the telescope?If this telescope is used to view Moon, what is diameter of the image of Moon formed by the objective lens?

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Compare the function of the objective lens of a telescope with the objective of a?

Monday, April 26th, 2010 at 7:40 am

Comments (4)

Compare the function of the objective lens of a telescope with the objective of a
microscope. In each case, do you want a large focal length or small? Why? Where is your
object? Where and what kind of image is formed? Compare the function of the eyepiece
in both instruments. Do you want a large focal length or small? Why? Where is your
“object”? Where and what kind of image is formed?