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

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

1.the magnification is 1000

2.the length of the telescope tube is 20.02 m

3.the image formed of inverted

4.all of these

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