I need help with these problems!? - best lenses for 10 inch dob
Use the distance formula to find the unknown value.
40. d = 100 km, r = t = 5 hours ______,
41. d = 360 km, r = 40 km / h, t = ____
42. d = 420 km, R = t = 7 hours ____,
47. Telescopes will be described by its f / number. The F / number is divided by the equation f = E from D, with f given F / F is the focal point of the telescope, and D is the width of the telescopic lens. Use the f / number of equation to the focal length (in cm) of a telescope with a 10 - inch wide and a lens of f / number 9
Please help me!
Friday, February 12, 2010
Best Lenses For 10 Inch Dob I Need Help With These Problems!?
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40. d = 100 km, r = 100 / 5 = 20 miles / h, t = 5 hours
41. d = 360 km, r = 40 km / h at t = 360/40 = 9
42. d = 420 km, R = 420 / 7 = 60 mile / h, t = 7 hours
47. f = F / D.
Here, f = 9, D = 10 mm, N = 9 * 10 = 90 F-inch
Thus, the lens focal length = 90 inches.
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