The Moon has a diameter of 3.48 * 10³ km,and is at a distance of 3.84 * 10⁵ km from the Earth's surface.A camera with a lens of focal length 400 mm is used to photograph the Moon.What is the diameter of the Moon's image on the film? A)0.01 mm B)0.43 mm C)1.25 mm D)3.625 mm E)35 mm

Question

Quizplus · Accepted Answer

The diameter of the Moon's image on the film is given by the ratio of the focal length of the lens to the distance between the lens and the object. In this case, the distance between the lens and the object is the distance between the Earth's surface and the Moon, which is 3.84 * 10^5 km. The focal length of the lens is 400 mm, which is 0.4 m. Therefore, the diameter of the Moon's image on the film is 0.4 m / 3.84 * 10^5 km = 3.625 mm.

The Moon Has a Diameter of 3