The Focal Lengths of the Objective and the Eyepiece in a Microscope

question 29

Multiple Choice

The focal lengths of the objective and the eyepiece in a microscope are 0.29 cm and 2.50 cm,respectively.An object is placed at 0.30 cm from the objective lens and the image of this object is viewed with the eyepiece adjusted for minimum eyestrain (with the eye focused at the far point) .The near point of the person using the microscope is 25 cm and the far point is at infinity.What is the final overall magnification of the microscope?

• A) -190 x
• B) -240 x
• C) -300 x
• D) -320 x
• E) -470 x

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Definitions:

Macromolecules

Large molecules essential for life, including proteins, nucleic acids, carbohydrates, and lipids, which perform a variety of vital functions in cells.

Competitive Inhibition

A form of enzyme inhibition where a substance competes with the substrate for binding to the active site of the enzyme.

Enzymes

Enzymes are biological molecules, typically proteins, that significantly speed up the rate of virtually all chemical reactions within cells without being consumed by those reactions.

Substrate

In biochemistry, the reactant that an enzyme acts upon to catalyze a chemical reaction.