The graduation exam was coming soon. Xiao Ming suggested to his class teacher, Mr. Li, that the whole class take a graduation photo together as a souvenir and took the initiative to take the photo. T

The graduation exam was coming soon. Xiao Ming suggested to his class teacher, Mr. Li, that the whole class take a graduation photo together as a souvenir and took the initiative to take the photo. Teacher Li said

(1) The camera uses a convex lens to form an inverted and reduced real image; when the camera images, the image distance is greater than one focal length and less than twice the focal length. Therefore, the focal length of the camera lens is 60mm, and the distance between the film and the lens is The distance is between 60mm and 120mm. Since the object distance is very large when shooting ground scenes on an airplane, the image distance will be small, so the bottom is closer to the focus position.

(2) From B to A, the image becomes larger, the object distance needs to decrease, and the image distance needs to increase, so before pressing the shutter, the camera needs to be close to the classmate and the lens needs to be extended forward.

So the answer is: (1) The convex lens forms an inverted, reduced real image; D; (2) ① The camera is close to the classmate; ② The lens extends forward.