The function of a finderscope is to find approximately the location of the object or place where we must be viewed. It is pointed in the same direction as a telescope. It is nothing but a small telescope attached to the main telescope of the body. Finderscopeįinderscope is not an essential but an important part of a telescope. It improves its focal length by just adjusting the knob. Generally, the diameter of the telescope is about 8 inches. Telescopic TubeĪ telescopic tube is the body of any telescope which contains a primary mirror. Magnification Power = Focal Length of Objective lens / Focal Length of Eyepiece lens. In final words, the smaller the focal length higher the magnification power. Generally, the magnification of the telescope can be calculated by the ratio of the focal length of the objective lens to the focal length of the eyepiece lens. The eyepiece comes with different focal lengths. The function of the eyepiece is to magnify the image that we must view. The eyepiece is the part of a telescope by which we can see our specific object. For some handheld telescopes, a tripod is used as structural support. This telescope is highly efficient and very easy to handle. So that it mounts on the robust structures & can move on the horizontal and vertical axis. Structural Support / TripodĪs we know, high-power telescopes are huge and difficult to handle with our hands. The primary curved mirror forms an objective, while the secondary curved mirror is placed at the focus of the first mirror inside the telescope body. These two mirrors are called primary and secondary mirrors. Depending upon design consideration, the shape of the mirror can be plane, parabolic, or hyperbolic. The objective lens is at the front side to focus on the image, and the eyepiece lens is at the backside of the telescope for magnification. The objective lens is convex, while the eyepiece lens is concave in shape. The bigger lens is an objective lens, while the smaller lens is an eyepiece lens.

In most refracting telescopes, there are two lenses in which is the objective lens, and the other is the eyepiece lens. The lens is one of the necessary parts of a telescope.

Parts of a telescope three part cards