The Focal Length of the Lens of a Simple Film

question 75

Multiple Choice

The focal length of the lens of a simple film camera is 40.0 mm.By what amount should the distance between the lens and the film be increased or decreased to change the focus from a person who is 25 m from the lens to one who is 4.0 m from the lens?

• A)0.2 mm
• B)0.3 mm
• C)0.4 mm
• D)0.5 mm
• E)0.7 mm

---

Definitions:

Subjectivity

The quality of being based on or influenced by personal feelings, tastes, or opinions, as opposed to objective, measurable facts.

Research

is the process of systematically observing reality to assess the validity of a theory.

Deception

The act of misleading or providing false information to others in order to gain an advantage or hide the truth.

Experimental Research

A research methodology that assesses cause-and-effect relationships by manipulating one or more variables while holding others constant to study their effects on certain outcomes.