1. Light from a distant star is collected by a concave mirror. How far from the mirror is the image of the star if the radius of curvature is 150 cm? 2. 1/f = 1/do + 1/di 3. 1/f = 1/do + 1/di f = 150/2 = 75 cm di = dof/do - f = do(75)/do- 75 I don't know what do is or if there is one. If there is one, can you tell me what it is. Thank You!!