0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
What advantages do reflecting telescopes have over refracting telescopes?
refracting telescopes use lenses instead of mirrors. 1. chromatic aberration: when light passes through a lens it is focused at different points. Blue focuses closer to lens and red farther creating a smeared image. 2. Some light is absorbed by lenses. 3. Lenses are heavy and can only be supported by the edge. 4. Lenses must have to optically acceptable surfaces whereas a mirror only needs one.
Why have no large refracting telescopes been built since 1900?
Refracting telescopes suffer from chromatic aberration, refracting telescopes have several surfaces to shape and polish, making large glass lenses without interior defects is very difficult, and large glass lenses are more difficult to support than large mirrors.
What is magic telescope?
its those telescopes with an image at the end. you turn the end and the images changes shape. usually given to children to play with.
Why do all large optical telescopes use mirrors to collect light rather than lenses?
Light goes through the lens but not through the mirror. -- So any imperfection inside the lens can affect the behavior of the light, but an imperfection inside the mirror can't. -- So the lens must be made of the finest, purest material through and through, but the mirror can be made of any material that can hold the shape of one surface ... metal, granite, etc. The mirror doesn't even have to be glass. -- Both surfaces of the lens must be accurately curved and polished, and they must be perfectly parallel to each other. Only one surface of the mirror has to be optically perfect in shape; the others can be pocked, dimpled, honeycombed, scratched, drilled, chipped, etc. -- The lens can only be supported by its edge, and must be rigid enough that no part of it will bend or deform under its own weight, no matter what position it's in. The mirror can be supported all around its sides and all over its back. It can even be fitted with computerized plungers along its back, to push on it and correct its shape if it sags or bends.
How To determine the size and shape of a planet?
Planets are always approximately spherical in shape. Because of their rotation, they do bulge slightly at the equator, creating a shape called an oblate spheroid. This can be observed directly with telescopes. As for the size of planets, we have observed them a lot, not just with telescopes but also with planetary probes, but in addition to that, the way satellites orbit a planet (their distance and speed) tells us about the planet's gravitational field, and hence, its mass. Most planets have satellites.
How does a concave mirror affect light?
A concave mirror will tend to "focus" light to some degree, depending on the curvature of the mirror. A parabolic mirror will bring reflected light to a sharp focus, and telescopes use this type of curve for the shape of their reflective surface. And for exactly the reasons you think they do. Want links? You got 'em....
How does adaptive optics in telescopes help solve problems caused by atmospheric turbulence?
The atmosphere is a chaotic mixture of gases and vapours. The turbulences in the atmosphere distort the paths of light-rays falling on the Earth from distant celestial objects, thereby distorting the images they form in telescopes.To compensate, the more advanced modern telescopes use lasers to measure the current distortion in the atmosphere directly in the path of the telescope, and use those measurements to change the shape of the mirror in the telescope from millisecond to millisecond, thereby cancelling much of those distortions.
Is concave mirror in shape of parabola?
no concave mirror is in shape of concave mirror
How does a cartographer lessen distortions in size and shape by curving lines of longitude?
when you curve the lines of longitude it's more accurate because the globe is curved so it lessens the distortions.
What are the release dates for Mirror Mirror - 2010 Volume and Shape?
Mirror Mirror - 2010 Volume and Shape was released on: USA: 20 November 2010
Josie bought a new mirror The mirror has 5 sides What is the shape of the mirror?
Pentagon
How are mirror lenses classified?
by shape
How adaptive optics in a telescope help solve problems caused by atmospheric turbulence?
The atmosphere is a chaotic mixture of gases and vapours. The turbulences in the atmosphere distort the paths of light-rays falling on the Earth from distant celestial objects, thereby distorting the images they form in telescopes.To compensate, the more advanced modern telescopes use lasers to measure the current distortion in the atmosphere directly in the path of the telescope, and use those measurements to change the shape of the mirror in the telescope from millisecond to millisecond, thereby cancelling much of those distortions.
How does changing the shape of the mirror affect the shape of the image?
simplee yep
Why do flat maps have distortions?
because there has to be some kind of distortion of earths spherical shape
Why convex mirror called diverging mirror?
A convex mirror reflects light in diverging directions due to its shape.
Do mirror reflect light?
If it's really a "mirror", then it reflects light, regardless of its shape.
