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A 2-inch, f/4 reflector has a focal length of: 6 inches 8 inches 4 inches 2 inches
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A 2-inch, f/4 reflector has a focal length of:

6 inches
8 inches
4 inches
2 inches

A 2-inch, f/4 reflector has a focal length of: 6 inches 8 inches 4 inches 2 inches-example-1
User Firefly
by
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1 Answer

7 votes
I’m pretty sure it’s 8 sorry if I’m wrong
User Ilias
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