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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 ofthe 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 increase the brightness and reduce chromatic aberration of the image

Text Solution

Verified by Experts

The correct Answer is:
1,2,3
The length of the telescope tube is
` f_(0) + f_(e)= 20 + (0.02)=20.02`m
Also m=`20//0.02` = 1000
Also, the image formed is inverted.
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