Large, thin mirrors, sometimes called “floppy mirrors,” sag under their own weight. To correct for this, a. a rigid support system is attached to the back of the mirror. b. computer-controlled thrusters are placed under the mirror to change the shape of the mirror several times per second. c. a secondary mirror is used to focus the light. d. a correcting lens is placed in front of the objective mirror.
Large, thin mirrors, sometimes called “floppy mirrors,” sag under their own weight. To correct for this, a. a rigid support system is attached to the back of the mirror. b. computer-controlled thrusters are placed under the mirror to change the shape of the mirror several times per second. c. a secondary mirror is used to focus the light. d. a correcting lens is placed in front of the objective mirror.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Large, thin mirrors, sometimes called “floppy mirrors,” sag under their own weight. To correct for this,
a. |
a rigid support system is attached to the back of the mirror.
|
|
b. |
computer-controlled thrusters are placed under the mirror to change the shape of the mirror several times per second.
|
|
c. |
a secondary mirror is used to focus the light.
|
|
d. |
a correcting lens is placed in front of the objective mirror.
|
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