A camera is used to photograph the full moon,which has an angular diameter of 0.51 $\degree$.The image on the film is 3.2 mm in diameter.What is the focal length of the lens?
A)3.2 mm
B)720 mm
C)360 mm
D)1130 mm

Question

Quizplus · Accepted Answer

The angular diameter of the moon is 0.51 degrees. Using the formula for angular size, θ = (d / f) * (180/π), where d is the image diameter and f is the focal length, we can solve for f: f = (d * 180) / (θ * π). Substituting d = 3.2 mm and θ = 0.51 degrees, we find f ≈ 360 mm.

A Camera Is Used to Photograph the Full Moon,which Has °\degree°

A Camera Is Used to Photograph the Full Moon,which Has $\degree$