What visual effect does a convex lens have on objects?

• A. It distorts them
• B. It magnifies them
• C. It shrinks them
• D. It makes them disappear

Answer: (B)

A convex lens has the ability to magnify objects due to its specific shape, which is thicker in the center and thinner at the edges. This shape causes light rays that pass through the lens to converge, meaning they are bent toward each other. When viewing an object through a convex lens, the light rays coming from the object are brought together to form a larger image on the other side of the lens.

The magnification occurs because the lens allows the observer to see a much larger version of the object than would be visible to the naked eye without the lens. This is particularly useful in devices like magnifying glasses, eyeglasses for farsightedness, and cameras, where enhancing the size of the image can enhance clarity and detail.

In contrast, other options do not accurately describe the behavior of a convex lens. Distortion typically refers to an alteration in the shape of an image, which does not apply as the lens primarily magnifies without altering proportions. Shrinking an object visually would not correlate with a convex lens's properties, and making an object disappear contradicts the fundamental action of a lens which is to refract and project an image. Thus, the primary effect of a convex lens is indeed magnification.