A System of Two Converging Lenses Is Used to Examine

question 58

Multiple Choice

A system of two converging lenses is used to examine a leaf from a distance (to the first lens) of 25cm.If the focal lengths of the two lenses are 12 cm and 17 cm,respectively,and the overall magnification is -0.481,then what distance is there between the two lenses?

• A)7.5 cm
• B)73 cm
• C)29 cm
• D)14 cm
• E)None are correct.

---

Definitions:

Motor Units

A single motor neuron and all the muscle fibers it innervates, functioning as the basic functional unit in muscle contraction.

Muscle Twitches

Involuntary, fine movements of a small area of muscle, often caused by stress, fatigue, or mineral imbalances.

All-Or-None Principle

When a stimulus is applied to a cell, an action potential is either produced or not. In muscle cells, the cell either contracts to the maximum extent possible (for a given condition) or does not contract.

Chemical Process

A process involving chemical reactions in which substances are transformed into different substances, crucial in both biological and industrial contexts.