The Focal Length of a Thin Lens Is 40 Mm

question 58

Multiple Choice

The focal length of a thin lens is 40 mm and its aperture diameter is 10 mm.What is the f-number of this lens?

• A) f/4.0
• B) f/2.0
• C) f/5.6
• D) f/0.30
• E) f/0.40

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Definitions:

Axons

Long, slender projections of nerve cells that transmit electrical impulses away from the neuron's cell body.

Somas

The cell bodies of neurons, containing the nucleus and cytoplasm, which are essential for the neuron's function and health.

Terminal Buttons

Terminal buttons are the small nodules at the end of axons that release chemical neurotransmitters, which facilitate the transmission of signals from one neuron to another.

Axons

Long, threadlike parts of a nerve cell along which impulses are conducted from the cell body to other cells.