A Compound Microscope Has a 18-Cm-Long Barrel and an Objective

question 57

Multiple Choice

A compound microscope has a 18-cm-long barrel and an objective lens with a focal length of 8.0 mm. What is the focal length of the eyepiece to give a total magnification of 240? It is adjusted for
Minimum eyestrain for persons with a near point of 25 cm.

• A) 2.3 cm
• B) 2.1 cm
• C) 1.9 cm
• D) 1.5 cm
• E) 1.3 m

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Definitions:

Panic Attacks

Sudden, intense surges of fear or discomfort, often accompanied by physical symptoms like heart palpitations, shortness of breath, or dizziness.

Racing Heart

A rapid beat of the heart, often felt as palpitations, which can be triggered by excitement, stress, or medical conditions.

Intense Fear

Intense Fear is an overwhelming and profound emotional response to perceived or real threats, leading to various physiological and behavioral changes.

Anorexia Nervosa

A psychological and potentially life-threatening eating disorder characterized by extremely low body weight, an intense fear of gaining weight, and a distorted perception of body weight and shape.