Which of the following is correct correction mirror and lenses used in the Cassegrain telescope?

Which mirror is used in Cassegrain telescope?

The Cassegrain reflector is a combination of a primary concave mirror and a secondary convex mirror, often used in optical telescopes and radio antennas, the main characteristic being that the optical path folds back onto itself, relative to the optical system’s primary mirror entrance aperture.

What are Cassegrain telescopes used for?

Cassegrain reflector, in astronomical telescopy, an arrangement of mirrors to focus incoming light at a point close to the main light-gathering mirror. The design was proposed in 1672 by French priest Laurent Cassegrain.

What type of image is formed by Cassegrain telescope?

The Cassegrain telescope is an astronomical reflecting telescope, in which the light is incident on a large concave paraboloid mirror, and reflected onto a smaller convex hyperboloid mirror. This reflected light is reflected again through a hole in the concave mirror to finally form the image.

What is a Cassegrain telescope design?

The Cassegrain telescope is a type of reflecting telescope which employs a combination of a primary concave mirror and a secondary convex mirror into its design. In the classic Cassegrain telescope, a parabolic primary mirror has a hole placed in its center.

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How does a Cassegrain reflecting telescope work?

The Cassegrain telescope is an astronomical reflecting telescope, in which the light is incident on a large concave paraboloid mirror, and reflected onto a smaller convex hyperboloid mirror. This reflected light is reflected again through a hole in the concave mirror to finally form the image.

How a Schmidt Cassegrain telescope works?

Schmidt-Cassegrain telescopes are a catadioptric design, meaning they use both lenses and mirrors. … It is reflected from a concave primary mirror at the back of the scope which focuses the light to the front of the telescope where it is reflected again by a smaller, convex secondary mirror.

Why do catadioptric or Cassegrain telescopes use both concave and convex mirrors?

Catadioptric telescope designs (which combine both lenses and mirrors) may provide better aberration correction than other all-lens or all-mirror telescopes over a wider aberration-free field of view, but their principle advantages for the amateur astronomer are in mechanical size and weight reduction.

Why is the secondary mirror convex?

Unlike the primary mirror, which is molded into the shape of a hexagon, the secondary mirror is perfectly rounded. The mirror is also convex, so the reflective surface bulges toward a light source.

Which lens types are in the telescope design based on a spy glass?

Figure 1. (a) Galileo made telescopes with a convex objective and a concave eyepiece. These produce an upright image and are used in spyglasses. (b) Most simple telescopes have two convex lenses.

Who made the Cassegrain telescope?

1629 – 1 September 1693) was a Catholic priest who is notable as the probable inventor of the Cassegrain reflector, a folded two-mirror reflecting telescope design.

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Laurent Cassegrain
Known for Cassegrain reflector
Scientific career
Fields Optics: Telescope
Institutions Collège de Chartres

When was the Cassegrain telescope invented?

In 1672, Cassegrain invented a new kind of reflecting telescope.

What type of telescope is a Schmidt Cassegrain?

The Schmidt–Cassegrain is a catadioptric telescope that combines a Cassegrain reflector’s optical path with a Schmidt corrector plate to make a compact astronomical instrument that uses simple spherical surfaces.

What is the difference between a Cassegrain and a Schmidt Cassegrain telescope?

The main difference between Schmidt-Cassegrains and Maksutov-Cassegrains is the corrector lens at the front of the telescope. Both scopes use spherical mirrors which induce spherical aberration. … Also, Maksutov-Cassegrains usually have longer focal ratios than SCTs, making them less well-suited for deep-sky photography.

Where is the focus for a Cassegrain telescope?

The principal focus of a Cassegrain telescope, located just behind the primary mirror.