You are building a reflecting telescope using a primary mirror with radius of curvature R = 3000 mm and diameter D =250 mm, and an assortment of eyepieces including a 7.5 mm, 15mm, and 30 mm. What is A) the focal length of the primary mirror, B) the F/# of the primary mirror, C) the system magnification using the 15 mm eyepiece? D) Which eyepiece would double the magnification of the telescope compared to that of the 15 mm eyepiece?

You are building a reflecting telescope using a primary mirror with radius of curvature R = 3000 mm and diameter D =250 mm, and an assortment of eyepieces including a 7.5 mm, 15mm, and 30 mm. What is A) the focal length of the primary mirror, B) the F/# of the primary mirror, C) the system magnification using the 15 mm eyepiece? D) Which eyepiece would double the magnification of the telescope compared to that of the 15 mm eyepiece?