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An astronomical refractive telescope has...

An astronomical refractive telescope has an objective of focal length 20 m and an eyepiece of focal length 2 cm.

A

The length of the telescope tube is 20.02 m.

B

The magnification is 1000.

C

The image formed is inverted

D

An objective of a larger aperture will incrase the brighness and reduce chromatic aberration of the image.

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