A Projector Lens Is Needed to Form an Image on a Screen

question 66

Multiple Choice

A projector lens is needed to form an image on a screen 6 times the size of its corresponding object.The screen is located 8.65 m from the lens.What is the required focal length of the lens?

• A)1.44 m
• B)7.41 m
• C)1.24 m
• D)0.721 m
• E)1.73 m

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Definitions:

Doubling Time

The period it takes for a quantity to double in size or value, often used in demography to describe the rate of population growth.

Population Growth

The increase in the number of individuals in a population, often measured by the rate at which the population is increasing.

Birth Rates

The number of live births per thousand of the population per year.

Emigration Rate

The measure of how many individuals per thousand leave a country or region to reside elsewhere within a specified time frame.