Describe the construction and action of astronomical telescope
Answers
Answer:
An astronomical telescope works on the principle that when an object to be magnified is placed at a large distance from the objective lens of telescope, a virtual, inverted and magnified image of the object is formed at the least distance of distinct vision from the eye held close to the eye piece.
Answer:
An astronomy telescope is an optical apparatus that magnifies the picture of distant celestial bodies such as stars, planets, satellites, and galaxies.
Explanation:
Construction:
Two convex lenses make up an astronomical telescope: an objective lens O and an eye piece E. The objective lens of an astronomical telescope has a longer focal length fo than the eyepiece's focal length fe. And, in comparison to the eye piece, the aperture of objective lens O is larger, allowing it to accept more light from the far object and generate a vivid image of the distant object. The objective lens and the eye piece are both attached to the free ends of two sliding tubes at a proper distance.
Working:
A parallel beam of light from a celestial body, such as a star, a planet, or a satellite, falls on the telescope's objective lens. The objective lens creates a true, inverted, and decreased picture of the celestial body A'B'. This picture (A'B') now serves as an object for the eye piece E, which is adjusted to place the image between the focus fe' and the eye piece's optical centre C2. The eyepiece now creates a virtual, inverted, and greatly enlarged picture of the item at infinity. The telescope is considered to be in 'normal adjustment' when the final picture of an object is produced at infinity.
