Explore what factors are related to the size of convex lens imaging: Question: Xiaoming knows that a magnifying glass is a convex lens through the study of previous physical knowledge.

Xiao Ming observed his finger with a magnifying glass, and the finger was in a focal length of the convex lens, forming an upright and enlarged virtual image; Using it to observe the distant house, the house is upside down, reduced to twice the focal length of the convex lens.

Because the distance between the object and the convex lens is different, the imaging properties of the convex lens are different, so the imaging size of the convex lens may be related to the distance between the object and the convex lens.

(1) According to the object distance in the table from 40cm to 15cm, the object distance decreases, the image distance increases and the image becomes larger.

(2) Myopic glasses are concave lenses, which have divergent effects on light. Wearing a pair of nearsighted glasses on your eyes, the originally converged light will be misunderstood and a clear candle flame image will appear on the screen. However, if you remove the nearsighted glasses, the candle flame image will become blurred, so that a clear image will appear on the screen, and the screen will be close to the convex lens. When the convex lens becomes a real image, the object distance decreases, the image distance increases and the image becomes larger. When the convex lens and the light screen are not moving, the candle can be close to the convex lens.

So the answer is: zoom in; Fall head; Shrinking; Distance from object to convex lens; (1) is large; Big; (2)C。