Mell Why the concave mirror of a reflecting telescope can be made much larger than the objective lens of a refracting telescope?
A telescope can also be made with a concave mirror as its first element or objective, since a concave mirror acts like a convex lens as seen in Figure 3. Mirrors can be constructed much larger than lenses and can, thus, gather large amounts of light, as needed to view distant galaxies, for example.
Why do Catadioptric 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 concave mirror is used in telescope instead of plane mirror?
Answer: A combination of concave and convex mirrors and lenses is used to collect a larger area of light and focus it onto a smaller, possibly brighter image surface. Concave mirrors in particular would be used in the collection and focus of the initial light received.
What advantages does a reflector have over a refractor?
Reflecting telescopes have a number of other advantages over refractors. They are not subject to chromatic aberration because reflected light does not disperse according to wavelength. Also, the telescope tube of a reflector is shorter than that of a refractor of the same diameter, which reduces the cost of the tube.
Which mirror is used in street lamps?
convex mirror
Hence, comparing all the given options, it can be concluded option B is correct; a street light bulb uses the convex mirror as reflectors. Note: Reflectors light bulbs are generally used in the heavy light application, in floodlights and in spotlights. Reflectors are used because they can spread light in a large area.
How does a telescope use a concave mirror?
In reflector telescopes the objective (Light collecting equipment) is a parabolic mirror.This collects light and focus on a diagonal mirror which is magnified by the ye piece. picture credit A level physics tutor .com. more details use this link. How Telescopes Work
How big of a telescope can you build without mirrors?
The extra amount of light you would gain by using CCDs without mirrors is tiny, as you only lose about 5-10% of your light per reflection, but gain an extra 1500% (that is not a typo!) by going from a 10-meter diameter to a 39-meter diameter telescope.
Why are telescopes not able to take infrared pictures?
1. Not all wavelengths of light may pass through lenses. For example, infrared is easily absorbed by glass lenses, so we can’t use them to take infrared pictures.
Why do we use mirrors to take infrared pictures?
For example, infrared is easily absorbed by glass lenses, so we can’t use them to take infrared pictures. Images of different wavelengths are useful for understanding temperature of stars or different objects in a galaxy etc. Mirrors reflect all wavelengths of light, which allows people to gather as much information as possible.