Explain the construction and working of optical telescope with picture
Answers
Answer:
Refracting telescopes work by using two lenses to focus the light and make it look like the object is closer to you than it really is. Both lenses are in a shape that's called 'convex'. Convex lenses work by bending light inwards (like in the diagram). This is what makes the image look smaller.d
Refracting Telescopes
Refractors use lenses to refract (bend) incoming light through a tube to a focal point. Refractors typically have two lenses. The objective lens is the lens at the front of the telescope through which the light passes. The eyepiece or lens is the lens, which magnifies the image.
Answer:
Optical Telescope:-
What is optical telescope?
An optical telescope is a telescope that gathers and focuses light mainly from the visible part of the electromagnetic spectrum, to create a magnified image for direct visual inspection, to make a photograph, or to collect data through electronic image sensors.
What are it's main types?
- Refracting telescopes have a curved lens at one end that focuses the light down a long tube towards a second lens, called the eyepiece, which magnifies the image.
- Reflecting telescopes use mirrors instead of lenses to collect light. In a reflector, the light travels down the telescope tube to the large primary mirror, which reflects the light back up the tube to the smaller secondary mirror, which in turn reflects the light towards the eyepiece. Because the light is reflected back and forth in reflecting telescopes, they are shorter than refractors where the light travels in a simple straight path from one end of the telescope tube to the other.
- Catadioptric telescopes are a special type of reflecting telescope where the light first passes through a curved lens at the top of the telescope tube before reaching the primary mirror.
On what it's ability depends?
An optical telescope's ability to resolve small details is directly related to the diameter (or aperture) of its objective (the primary lens or mirror that collects and focuses the light), and its light-gathering power is related to the area of the objective. The larger the objective, the more light the telescope collects and the finer detail it resolves.
Where is it used?
People use optical telescopes (including monoculars and binoculars) for outdoor activities such as observational astronomy, ornithology, pilotage, hunting and reconnaissance, as well as indoor/semi-outdoor activities such as watching performance arts and spectator sports.
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