The moon's diameter is 3.48x106 m, and its mean distance from the earth is 3.85x108 m. The moon is being photographed with a camera whose lens has a focal length of300 mm. (a) Discover the diameter of the moon's image on the slide film. (b) When the slide is projected onto a screen that is 13.0 m from the lens of the projector (f = 110.0 mm), what is the diameter of the moon's image on the screen?
a) diameter of moon's image on slide film
b) diameter of moon's image on the screen