Question

Explain the working of an astronomical
telescope using refraction of light with suitable diagram.
[5 Marks question]​

Answer 1

Explanation:

Here is the answer to the question

Answer 2

Answer:

The astronomical telescope consists of two lenses: objective and eyepiece. Objective has larger focal length and diameter to accommodate maximum amount of light coming from the far away (astronomical) objects. A parallel beam of rays from an astronomical object is made to fall on the objective lens of the telescope. It forms a real, inverted and diminished image A′B′ of the object. The eyepiece is so adjusted that A′B′ lies just at the focus of the eye piece. Therefore, a highly magnified image of the object is formed at infinity. The same has been shown in the figure below.