Question

The final image formed by an astronomical telescope is:
A. real and erect
B. virtual and erect.
C. real and inverted
D. virtual and inverted

Answer 1

Hint: Astronomical telescope is an instrument that is a set-up of 2 or more optical lenses. A basic module of an astronomical telescope has 2 convex lenses named as objective lenses and eyepieces. Images formed by the complex mirrors are real images. When the rays of light come from a very far point (infinity) an inverted image can be obtained by a convex lens.

Complete answer:
Before going into the question we should know what an astronomical telescope actually is and what it looks like. So, basically a simple module of an astronomical telescope is an instrument of 2 convex lenses which are arranged in such a way that they magnify the distinct astrological objectives.

One of the lenses is known as an objective lens and the other is referred to as an eyepiece. Eye piece is comparatively smaller in size than the objective lens. The objective lens have h very have focal length.

The objective lens and the eyepiece are coordinately paced in such a way that the focal point of the objective comes between the focal length of the eye piece. The above diagram represents the working of the astronomical telescope. Where the light rays coming at the objective lens converge at its focal point after the refraction. As a result of this first refraction a real inverted image A’B’ is formed between the focal length of the eyepiece. This image magnifies with the help of the eye piece and a real inverted magnified image is formed behind the focus point of the eye piece A”B”. This is the final image which we are able to see through the astronomical telescope.

Now, it is asked in the question what would be the nature of the image formed by the astronomical telescope. From the above explanation we can conclude very clearly that the nature of the image will be real and inverted.

So, the correct answer is “Option C”.

Note:
Keep in mind that the telescope can have more than 2 optical lenses that depend on the resolution of the instrument. Here we have considered a basic module of the telescope. In all the telescopes the image formed will real in inverted only.