Which statement is true regarding the Snellen chart?

The correct statement describes the ability of the normal eye to distinguish two points that are separated by 5 minutes of arc. This measurement is significant in the field of vision and optics, as it relates to visual acuity testing.

Visual acuity is commonly assessed using the Snellen chart, which displays letters of varying sizes. The standard measure of 20/20 vision corresponds to the ability to resolve visual details that subtend an angle of 5 minutes of arc at a distance of 20 feet. This means that a person with normal vision can distinguish between two points or features that are quite close to each other, enhancing our understanding of visual perception and clarity.

The other statements refer to angles of separation that are either too fine or too broad for typical human visual acuity. An angle of 1 minute of arc represents an exceptional level of detail that is not achievable by the average person under standard conditions, while 2 and 10 minutes of arc do not accurately represent the standard visual acuity associated with the normal human eye, which is why the statement regarding 5 minutes of arc holds true within these contexts.