The Lens of a Slide Projector Has a Focal Length

question 57

Multiple Choice

The lens of a slide projector has a focal length of 10.0 cm. It is used to project the image of a 35 mm slide (24 mm × 36 mm) onto a square screen located 6.0 m away. Of the following screen widths, which is the smallest that would allow the entire image to fit?

• A) 5.1 m
• B) 4.4 m
• C) 2.2 m
• D) 1.1 m
• E) 0.88 m

---

Definitions:

Flynn Effect

An observed increase in intelligence test scores, on average, over time, attributed to environmental factors like improved nutrition and education.

American Middle-schooler

A term denoting a student in the United States who is in middle school, typically ranging from ages 11 to 14.

Nigerian

Relating to Nigeria or its people, culture, or language, a West African country known for its diverse cultures, languages, and significant oil reserves.

Flynn Effect

The observed increase in IQ scores across generations, indicating a trend towards higher cognitive abilities over time.