What does a higher power of a lens indicate?

What does a higher power of a lens indicate?

• A. A shorter focal length and stronger light convergence
• B. A longer focal length and weaker light divergence
• C. The lens is designed for use in low-light conditions
• D. The lens can only focus light at extreme distances

Answer: (A)

A higher power of a lens indicates a shorter focal length and stronger light convergence. This relationship is fundamental in optics. The power of a lens is defined as the reciprocal of its focal length (in meters), expressed in diopters. Therefore, a lens with a higher power means that its focal length is shorter. When the focal length is shorter, light rays entering the lens converge more quickly, allowing the lens to focus light at a point closer to its surface. This is why high-powered lenses are commonly used for applications requiring strong magnification or for correcting significant vision impairments, such as in glasses for nearsightedness. In contrast, a longer focal length corresponds to a lower power, resulting in a lens that diverges light less aggressively and produces a wider field of view. The other options do not accurately describe the relationship between lens power, focal length, and light convergence characteristics.

A higher power of a lens indicates a shorter focal length and stronger light convergence. This relationship is fundamental in optics. The power of a lens is defined as the reciprocal of its focal length (in meters), expressed in diopters. Therefore, a lens with a higher power means that its focal length is shorter.

When the focal length is shorter, light rays entering the lens converge more quickly, allowing the lens to focus light at a point closer to its surface. This is why high-powered lenses are commonly used for applications requiring strong magnification or for correcting significant vision impairments, such as in glasses for nearsightedness.

In contrast, a longer focal length corresponds to a lower power, resulting in a lens that diverges light less aggressively and produces a wider field of view. The other options do not accurately describe the relationship between lens power, focal length, and light convergence characteristics.