When a photographer takes pictures from a helicopter in the sky to the ground, if the focal length of the lens of the camera is 100mm, the distance between the negative and the lens should be (

Test analysis: This question examines the characteristics of convex lens imaging law. When taking pictures at high altitude, the object distance is much larger than twice the focal length, which is an inverted and reduced real image. The image distance during imaging should meet the characteristics of less than twice the focal length and more than once the focal length. In addition, when the convex lens becomes a real image, it has the characteristics of "the object is near and the image is far". When the object is far away from twice the focal length, the image distance is close to twice the focal length. Therefore, taking pictures in the air, the object distance is much larger than twice the focal length, and the image distance will be infinitely close to twice the focal length, slightly larger than twice the focal length. So choose B.