A Lens of Focal Length 90 Mm Is Used as a Magnifier.The

question 21

Multiple Choice

A lens of focal length 90 mm is used as a magnifier.The object being viewed is 9.9 mm long,and is positioned at the focal point of the lens.The angle subtended by the image at infinity,in milliradians,is closest to:

• A)110
• B)73
• C)37
• D)147
• E)183

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Definitions:

Weak Axiom

A principle in consumer choice theory stating that if a consumer prefers bundle A over bundle B when both are available at the same prices, then the consumer will not purchase more of bundle B if its price rises.

Revealed Preference

An economic theory stating that the preferences of consumers can be understood by their purchasing habits.

Prices

The monetary value assigned to goods and services in a market, dictating the exchange rate at which these can be traded.

Laspeyres Price Index

An index that measures the relative change in the price level of a fixed basket of goods and services over time, using the quantities purchased in the base period.