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Hint: There are two kinds of telescopes: reflecting and refracting telescopes. Before, refracting telescopes were used mainly, but it had an error known as chromatic aberration, meaning failure of the lens to focus all the colours at a single point. This led to the use of different kinds of telescope, known as reflecting telescopes, developed by Newton in the 17th century.
Complete step by step answer:
The reflecting telescopes or Cassegrain telescopes, use the principles of reflecting in spherical and plane mirrors to focus a far-off object near the eye.
Here is a schematic picture of one such kind of reflecting telescope:
The major component of a reflecting telescope is the concave mirror.
The concave mirror is known as a converging mirror because it converges a ray of light travelling from infinity, to its focal point. Since it is a converging mirror, the concave mirror helps in converging the light from a far-off object to a point. At this point, there can be a plane mirror, as in this case, or a convex mirror for viewing by the user.
This particular type of telescope is also known as a reflector. The design of a reflecting telescope is such that it allows very huge diameter objectives. This is a main requirement in all applications of astronomy where the objective concave mirrors have very huge diameters, necessary for focussing the celestial bodies like stars or planets.
Note:
Refracting telescopes are mainly used for short-distance vision such as terrestrial vision or in cameras where there is a zoom option. This is because the huge size of the lens will result in chromatic aberration and hence, it is rarely used nowadays, for astronomical viewing.
Complete step by step answer:
The reflecting telescopes or Cassegrain telescopes, use the principles of reflecting in spherical and plane mirrors to focus a far-off object near the eye.
Here is a schematic picture of one such kind of reflecting telescope:
The major component of a reflecting telescope is the concave mirror.
The concave mirror is known as a converging mirror because it converges a ray of light travelling from infinity, to its focal point. Since it is a converging mirror, the concave mirror helps in converging the light from a far-off object to a point. At this point, there can be a plane mirror, as in this case, or a convex mirror for viewing by the user.
This particular type of telescope is also known as a reflector. The design of a reflecting telescope is such that it allows very huge diameter objectives. This is a main requirement in all applications of astronomy where the objective concave mirrors have very huge diameters, necessary for focussing the celestial bodies like stars or planets.
Note:
Refracting telescopes are mainly used for short-distance vision such as terrestrial vision or in cameras where there is a zoom option. This is because the huge size of the lens will result in chromatic aberration and hence, it is rarely used nowadays, for astronomical viewing.
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