Which of the following is NOT a characteristic of a minus lens?

Which of the following is NOT a characteristic of a minus lens?

• A. With motion
• B. Diverging light rays
• C. Negative focal length
• D. Thicker at the edges

Answer: (A)

A minus lens is characterized by its ability to diverge light rays, meaning that it spreads light outwards rather than converging it, which is crucial for correcting myopia (nearsightedness). The light rays entering a minus lens are bent away from the principal axis, leading to what is referred to as "diverging light rays." In terms of the physical properties of such lenses, minus lenses have a negative focal length. This negative value reflects the fact that, for a diverging lens, the focal point is virtual and located on the same side of the lens as the incoming light. Furthermore, the shape of a minus lens is such that it is thicker at the center than at the edges. This design helps to achieve the desired divergence of light rays, enabling the lens to effectively re-focus light for individuals who struggle with seeing distant objects clearly. Regarding motion, the term "with motion" generally refers to an effect seen when viewing through a lens. When looking through a diverging lens, if one moves an object toward it, it appears to move in the same direction as the object, known as "with motion". Therefore, motion is indeed observable with a minus lens. Understanding these characteristics underscores why "with motion" is not

A minus lens is characterized by its ability to diverge light rays, meaning that it spreads light outwards rather than converging it, which is crucial for correcting myopia (nearsightedness). The light rays entering a minus lens are bent away from the principal axis, leading to what is referred to as "diverging light rays."

In terms of the physical properties of such lenses, minus lenses have a negative focal length. This negative value reflects the fact that, for a diverging lens, the focal point is virtual and located on the same side of the lens as the incoming light.

Furthermore, the shape of a minus lens is such that it is thicker at the center than at the edges. This design helps to achieve the desired divergence of light rays, enabling the lens to effectively re-focus light for individuals who struggle with seeing distant objects clearly.

Regarding motion, the term "with motion" generally refers to an effect seen when viewing through a lens. When looking through a diverging lens, if one moves an object toward it, it appears to move in the same direction as the object, known as "with motion". Therefore, motion is indeed observable with a minus lens.

Understanding these characteristics underscores why "with motion" is not