The diameter of the full Moon in the focal plane of an average amateur's telescope (focal length 1.5 meters) is $13.8 \mathrm{mm}$ How big would the Moon be in the focal plane of a very large astronomical telescope (focal length 250 meters)?
Added by Dominique A.
Step 1
Given: Diameter of the Moon in the focal plane of the average amateur telescope = 13.8 mm = 13.8 x 10^-3 m Focal length of the average amateur telescope = 1.5 m Using the formula: height of the image = diameter of the object x distance of the object / focal Show more…
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