If You Want to Build a Telescope Having the Least

question 381

Multiple Choice

If you want to build a telescope having the least possible amount of chromatic aberration,you should use:

• A) a front lens that has been coated with a special material to reduce refraction.
• B) a front lens that is composed of two closely spaced lenses made of different kinds of glass.
• C) the thinnest front lens that you can obtain.
• D) mirrors instead of lenses.

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Definitions:

Exotoxins

Potent toxins secreted by bacteria that can cause damage to the host by destroying cells or disrupting normal cellular metabolism.

Capsules

In microbiology, a gelatinous covering that encloses some bacteria, enhancing their ability to cause disease.

Sex Pili

Hair-like structures on the surface of bacterial cells that are involved in the transfer of DNA during conjugation.

Chemical Signals

Molecules released by cells to communicate with each other, affecting the behavior or physiology of other cells.