What is Reflecting Telescope

Introduction of reflecting telescope:

Telescope is a device used for seeing the images which are too long. The visualization of image is very clear. The astronomical telescope is mainly for capturing the astronomical objects.

Classification of telescope:

Refracting telescope
Reflecting telescope
Let us see what is the reflecting telescope.

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Reflecting telescope:


Reflecting telescope:

If we want to know what is the reflecting telescope we first know the general diagram of telescope.Normally a telescope consists of two lenses.

In refracting telescope large aperture and large focal length of objective lens are used. The lens used in refracting telescope are convex lens. It is difficult to make large convex lens because it is very costly. Hence the reflecting telescope uses concave lens. Let us see the what is the construction of reflecting telescope.

Construction of reflection telescope:

Reflection telescope contains two type of lenses.

Objective lens:

The reflection telescope contains concave mirror having a large aperture and large focal length. This concave mirror is placed at the one end of the wide tube which is called objective.

The other terminal of the wide tube is set to be open and directed to the image object. There is a plane mirror M2 is set at the place before the principal focus of the concave mirror. The angle between the mirror M2 and the principal axis of mirror M1 is 450.

Eye piece:

There is another tube of narrow tube is placed at the side of the wide tube having a convex lens E. The aperture and length of this convex lens E is small which is called eye piece. This eyepiece is capable of moving. This construction helps us to understand what the reflection telescope.

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Working of reflecting telescope:


Working of reflecting telescope:

Consider a distant object is AB. The rays from an object is first fall on the mirror M1. Then the reflected rays are moving in the direction of principal axis and there they are reflected by the mirror M2. The mirror M2 form a diminished image named A’B’. This A’B’ image is considered as an image of the eye piece E. This eye piece creates a magnified virtual image A’’B’’ which is the final image of the telescope.