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

question 49

Multiple Choice

A lens of focal length 90 mm is used as a magnifier by a person with a near point of 25 cm.The object being viewed is 9.9 mm long,and is positioned at the focal point of the lens.What is the angle subtended by the image at infinity,in milliradians?

• A)110 mrad
• B)73 mrad
• C)37 mrad
• D)147 mrad
• E)183 mrad

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Definitions:

New Firms

Newly established business entities that often bring innovation, competition, and dynamism to their respective markets.

Long-Run Equilibrium

A state in which all factors of production and prices adjust fully to economic changes, with all markets clearing and no external pressures affecting supply and demand.

Efficient Scale

The quantity of output that minimizes average total cost.

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A market structure characterized by a large number of small firms, homogenous products, and free entry and exit.