questions about telescopes for astronomy?

I

Irish72

New member
You are using a 30-cm diameter telescope with a 120-cm focal length and an eyepiece with a focal length of 6mm. What is the magnifying power?

a.20
b.200
c.420
d.600
e.none of these

What is the normal maximum usable magnifying power of a 30-cm aperture telescope with a focal length of 200-cm?

a.10
b.300
c.4000
d.500
e.600

i'm not sure how i would calculate these to get the answers. Any ideas?
 
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