Correct Answer - Option 1 :
Swinging
Explanation:
Telescope:
A telescope is an optical instrument using lenses, curved mirrors, or a combination of both to observe distant objects, or various devices used to observe distant objects by their emission, absorption, or reflection of electromagnetic radiation.
Swinging the Telescope:
It is the process of turning the telescope about the vertical axis in a horizontal plane. The swing is called the right swing when the telescope is turned clockwise from the previous position. The swing is called the left swing when the telescope is turned anticlockwise from the previous position.
Plunging the Telescope:
It is the process of rotating
the telescope over the horizontal axis through 180 in the vertical plane. After plunging the telescope, the directions of the objective end and eyepiece end are reversed, and the telescope points exactly in the opposite direction.
Plunging is also known as transiting or reversing.
