The Focal Ratio of a Lens or Mirror Is the Ratio

question 21

Multiple Choice

The focal ratio of a lens or mirror is the ratio of its

• A)Focal length to diameter
• B)Diameter to thickness
• C)Magnification to diameter
• D)Focal length to thickness

---

Definitions:

Probability

The calculation of an event's chance of happening, depicted on a scale from 0 to 1.

Seat Belts

Seat belts are safety devices designed to secure the occupants of a vehicle against harmful movement that may result during a collision or a sudden stop.

Safety Roadblock

A temporary setup on roads by law enforcement or construction workers aimed at ensuring public safety by controlling or redirecting traffic.

O-Negative Blood

A blood type that lacks antigens in the ABO blood group system and the Rh factor, making it universally transfusable to patients of any blood type.