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If tube length of astronomical telescope is 150cm and magnifying power is 20cm for normal setting calculate the focal length of the objective?
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If tube length of astronomical telescope is 150cm and magnifying power...
Tube length, L=fo​+fe​=150cm

Magnification, m=fe​fo​​=20

⇒fo​=20fe​

20fe​+fe​=150

⇒21fe​=150

⇒fe​=21/150

⇒fe​=7.14

∴fo​=20×7.15=142.8cm

#hope it helps..
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If tube length of astronomical telescope is 150cm and magnifying power is 20cm for normal setting calculate the focal length of the objective?
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