Of the Following Distances, Which Is the Closest an Object

question 70

Multiple Choice

Of the following distances, which is the closest an object can be to a lens of focal length f and still produce a real image? (Note this is not the smallest possible distance, just the smallest of the provided choices.)

• A) 3f
• B) 2f
• C) 1.2f
• D) 0.8f
• E) 0.49f

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Definitions:

Chalk Formation

A type of soft, white, porous sedimentary rock composed mainly of calcite or aragonite, formed from the skeletal remains of microorganisms.

Microscopic Organisms

Tiny life forms, often single-celled, that can only be seen with the aid of a microscope.

Limestone

A sedimentary rock composed primarily of calcite or dolomite, widely used in construction and manufacturing.

Calcium Carbonate

A naturally occurring compound found in rocks, shells, and marine organisms, used widely in the manufacturing and construction industries.