What is a telescope Class 12?

A telescope is an instrument that is used to view distant objects. If you want to look at the planets, you can use a telescope.

What is a telescope in physics?

A telescope is a tool that astronomers use to see faraway objects. Most telescopes, and all large telescopes, work by using curved mirrors to gather and focus light from the night sky. The first telescopes focused light by using pieces of curved, clear glass, called lenses.

What is the magnification of telescope Class 12?

Note: The magnification power is the amount that a telescope enlarges with its subject. Moreover, it is equal to the telescope’s focal length divided by the eyepiece’s focal length. As a thumb rule, the telescope’s maximum useful magnification is 50 times its aperture in inches.

What are reflecting telescopes Class 12?

Telescopes with mirrors are called reflecting telescopes. The above telescope is also called a cassegrain reflecting telescope. They have mirror objectives as shown in the fig.

What is telescope and its types?

Telescopes are the optical instrument that is used to see distant objects such as stars and planets. Optical telescopes, Radio telescopes, X-Ray telescopes, Cosmic rays telescopes, and Gamma rays telescopes are some Common types of telescopes. Some other telescope types, uses, images are given in detail in this Guide.

What are the uses of telescope?

telescope, device used to form magnified images of distant objects. The telescope is undoubtedly the most important investigative tool in astronomy. It provides a means of collecting and analyzing radiation from celestial objects, even those in the far reaches of the universe.

What is a telescope easy definition?

1 : a usually tubular optical instrument for viewing distant objects by means of the refraction of light rays through a lens or the reflection of light rays by a concave mirror — compare reflector, refractor. 2 : any of various tubular magnifying optical instruments. 3 : radio telescope.

What are the 4 main types of telescopes?

• Refractor Telescopes.
• Reflector Telescopes.
• Dobsonian Telescopes.
• Maksutov-Cassegrain Telescopes.

What is the power of a telescope?

Magnification (power): The amount that a telescope enlarges its subject. It’s equal to the telescope’s focal length divided by the eyepiece’s focal length. As a rule of thumb, a telescope’s maximum useful magnification is 50 times its aperture in inches (or twice its aperture in millimeters).

What is the resolving power of telescope?

Resolving power is another important feature of a telescope. This is the ability of the instrument to distinguish clearly between two points whose angular separation is less than the smallest angle that the observer’s eye can resolve.

What is the formula of magnification of telescope?

Telescope magnification equation The magnification equation of a telescope is then: M = fo / fe , where: M is the magnification of the image.

What type of image is formed by telescope?

The objective lens produces a real, inverted image and the eyepiece acts as a simple magnifier and does not re-invert and produces a virtual image. So overall the image is inverted and virtual.

What are the 3 types of reflecting telescopes?

Reflecting telescopes use mirrors at the back of the tube to reflect the light instead of refracting it through a lens. The main types of reflecting telescopes are Newtonian, Dobsonian, and Cassegrain.

What shape is a telescope?

The primary mirror in most modern telescopes is composed of a solid glass cylinder whose front surface has been ground to a spherical or parabolic shape. A thin layer of aluminum is vacuum deposited onto the mirror, forming a highly reflective first surface mirror.

What are the 2 main types of telescopes?

There are two basic types of telescopes, refractors and reflectors. The part of the telescope that gathers the light, called the objective, determines the type of telescope.

What are the advantages of telescope?

• Superior revolving power per inch of aperture.
• Superior performance in inferior conditions – image steadier.
• Not reflections or interruption of light path.
• Near permanent optical alignment – minimum maintanance.
• Long focal ratios can mean use of longer focus, simplier, eyepieces.

What is the range of telescope?

Solution : Range of a telescope tells us how far away a star of some standard brightness can be spotted by the telescope.

What are the three major functions of a telescope?

There are three basic functions of a telescope (at least those used by most amateurs) – light gathering, resolving, and magnifying. Light gathering power is a measure of how much light the objective (primary mirror in a reflector, lens in a refractor) can collect from distant objects.

What is the most important function of the telescope?

Most people would say that the main function of a telescope is to make things look larger. But in fact, the most important function is to make things look brighter! This is called its light-gathering power.

Which mirror is used in telescope?

The mirror is a concave mirror. Similar to a convex lens, a concave mirror converges the light at the secondary mirror. The rays of light converge at the focal point.

Which lens is used in telescope?

The telescope must have one convex lens as one of the two lenses since the convex lens is used to magnify the objects by bending the path of light.

How do you draw a Class 12 telescope?

What’s an example of a telescope?

Optical Telescope: Optical telescopes are used for astronomy and in many non-astronomical instruments, including: theodolites (including transits), spotting scopes, monoculars, binoculars, camera lenses, and spyglasses. There are three main optical types: 1. The refracting telescope which uses lenses to form an image.

What is telescope made of?

A telescope consists of an optical system (the lenses and/or mirrors) and hardware components to hold the optical system in place and allow it to be maneuvered and focused. Lenses must be made from optical glass, a special kind of glass which is much purer and more uniform than ordinary glass.

What is two roots for telescope?

Telescope is from the Greek roots tele. “far,” and skopos, “seeing;” so it literally describes what the instrument does.