The Theoretical Limit to the Sharpness of Focus of a Lens

question 91

Multiple Choice

The theoretical limit to the sharpness of focus of a lens system is determined by

• A)spherical aberration limitations.
• B)chromatic aberration limitations.
• C)astigmatic limitations.
• D)diffraction limitations.
• E)the relative smoothness of the lens surface.

---

Definitions:

Electrical Stimulation

A therapeutic or research technique that involves applying electrical current to stimulate nerves, muscles, or brain areas.

Luigi Galvani

An 18th-century Italian physician and scientist known for his discovery of bioelectricity, especially in the context of muscle movement.

Gustave Fritsch

A nineteenth-century neuroscientist known for his pioneering work on the electrical stimulation of the brain.

Roberts Bartholow

A 19th-century American physician known for his pioneering work in neurology and for an ethical controversy in medically experimenting with electrical stimulation on a human subject's exposed brain.