The Focal Lengths of the Objective Lens and the Eyepiece

question 71

Multiple Choice

The focal lengths of the objective lens and the eyepiece in a microscope are 2.90 mm and 2.50 cm,respectively.An object is placed 3.00 mm from the objective.The image of this object is viewed with the eyepiece adjusted for minimum eyestrain for persons with a near point of 25 cm.What is the distance between the objective and the eyepiece?

• A)9.9 cm
• B)9.0 cm
• C)15 cm
• D)11 cm
• E)13 cm

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Definitions:

Concept Formation

The process of learning new categories by organizing and classifying information based on shared features or characteristics.

Algorithm

A methodical, logical rule or procedure that guarantees solving a particular problem. Contrasts with the usually speedier—but also more error-prone—use of heuristics.

Trial and Error

A problem-solving method involving repeated, varied attempts which are continued until success is achieved or the agent stops trying.

Heuristic

A simple thinking strategy that often allows us to make judgments and solve problems efficiently; usually speedier but also more error-prone than algorithms.