The Eyepiece of a Compound Microscope Has a Focal Length

question 43

Multiple Choice

The eyepiece of a compound microscope has a focal length of 2.50 cm,and the objective has a focal length of 1.60 cm.The two lenses are separated by 14.0 cm.The microscope is used by a person with normal eyes,having a near point at 25 cm.What is the magnitude of the magnification of the microscope?

• A)72
• B)88
• C)180
• D)219
• E)115

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Definitions:

Lone Pair Electrons

A pair of valence electrons that are not shared with another atom and hence do not participate in bonding but influence molecular shape and polarity.

Hydrogen Chloride

A diatomic molecule composed of hydrogen and chlorine; when dissolved in water, it forms hydrochloric acid.

Lewis Structure

A representation of molecules showing how the valence electrons are arranged among atoms in the molecule.

Ethane

A colorless, odorless gas that is the second simplest alkane, consisting of two carbon atoms and six hydrogen atoms.