Which device is used to produce a converging image by directing rays to a single point?

Which device is used to produce a converging image by directing rays to a single point?

• A. Prism
• B. Mirror
• C. Convex lens
• D. Concave lens

Answer: (C)

Rays directed to a single point come from a device that makes light converge. A convex lens does this: its shape is thicker in the middle, so incoming light rays bend inward as they pass through. Parallel rays (like light from a distant object) cross each other at the lens’s focal point on the other side, producing a converging image. A concave lens pushes rays apart, so it cannot focus them to a single point. A prism primarily disperses light into colors and does not focus rays to one spot. A mirror would only converge light to a point if it were a concave mirror, but the element that reliably brings rays to a single convergence point is the convex lens.

Rays directed to a single point come from a device that makes light converge. A convex lens does this: its shape is thicker in the middle, so incoming light rays bend inward as they pass through. Parallel rays (like light from a distant object) cross each other at the lens’s focal point on the other side, producing a converging image.

A concave lens pushes rays apart, so it cannot focus them to a single point. A prism primarily disperses light into colors and does not focus rays to one spot. A mirror would only converge light to a point if it were a concave mirror, but the element that reliably brings rays to a single convergence point is the convex lens.