The Focal Lengths of the Objective Lens and the Eyepiece

question 77

Multiple Choice

The focal lengths of the objective lens and the eyepiece of a microscope are 0.50 cm and 2.0 cm,respectively,and their separation is 6.0 cm when adjusted for minimum eyestrain for a person with a near point of 25.0 cm.If the microscope is focused on a small object,the magnitude of its final overall magnification is closest to

• A)50.
• B)100.
• C)150.
• D)200.
• E)250.

---

Definitions:

Dura Mater

Tough, fibrous membrane forming the outer covering of the brain and spinal cord.

White Matter

Tissue in the brain and spinal cord composed of myelinated nerve fibers, responsible for transmitting signals within the nervous system.

Gray Matter

Nervous system tissue made up of neuron cell bodies, dendrites, and unmyelinated axons, found in the brain and spinal cord, crucial for processing information.

Columns

In anatomical terms, columns refer to structures shaped like pillars, often found in the spinal cord, which consist of white matter that carries nerve impulses to and from the brain.