Grandma often does this when she reads a newspaper with a magnifying glass in order to see a bigger and clearer picture ().

A. Keep the newspaper and magnifying glass still and keep your eyes off the newspaper.

B. Keep your eyes still and keep the magnifying glass away from the newspaper.

C keep the newspaper and magnifying glass still and keep your eyes close to the newspaper.

D. Keep your eyes still and put the magnifying glass close to the newspaper.

Analysis:

A magnifying glass is a convex lens. It can be seen from the convex lens imaging experiment that when the object is in a focal length, the greater the object distance, the greater the image distance and the larger the image. It can also be concluded from the imaging principle that the light parallel to the principal axis is constant, but as the object moves away from the lens, the light passing through the optical center becomes more and more gentle, so the farther the intersection of the opposite extension lines of two rays is from the lens, the larger the image is. That is, when the focal length is less than 1 times, the closer the object is to the focal length, the larger the image is. So the answer is B.