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This process is called gravitational lensing and in many cases can be described in analogy to the deflection of light by (e.g. Their goal is to give an overview on gravitational lensing and on its wide phenomenology. If a radar signal is sent from A gravitational lens is a distribution of matter (such as a cluster of galaxies) between a distant light source and an observer, that is capable of bending the light from the source as the light travels towards the observer.This effect is known as gravitational lensing, and the amount of bending is one of the predictions of Albert Einstein's general theory of relativity. The amount of magnification is given by the ratio of the image area to the source area. A gravitational lens does just that: it can make a signal transpose an obstacle in the same way as the refraction of light in water. Learn more about gravitational lensing with host Caitlin Hofmeister.-----Like SciShow? Gravitational lensing is most effective (meaning the ring radius is largest) when the lensing object is half way between us the and background source. We outline an valuable experiment explained in Hartle. Gravitational lensing is a phenomenon by which a body containing a large mass (such as stars) bends the space around it and thereby bends the path of light as it travels. Gravitational lensing: Light around a massive object, such as a black hole, is bent, causing it to act as a lens for the things that lie behind it. Gravitational lensing is the bending of light by massive objects in between the observer (us), and a background source of light. These scripts aim at helping the students of the course on Gravitational Lensing to better understand the arguments discussed in the class. While gravitational lensing preserves surface brightness, as dictated by Liouville's theorem, lensing does change the apparent solid angle of a source. The gravitational lensing results in multiple images of the original galaxy each with a characteristically distorted banana-like shape or even into rings. We will start from the basics of the lensing … As explained in (Shapiro, 1964), since the speed of light is less when it is traveling through a gravitational eld, we can determine the additional time it needs to travel relatively to the time needed to cover the same distance in a vacuum. Galaxy cluster Abell 383 is a gravitational lens. glass) lenses in optics. It might sound like a surreal idea, but it has fascinated scholars for years, and is extremely helpful when we look out into the vast cosmos. Gravitational Lensing In general relativity, the presence of matter (energy density) can curve spacetime, and the path of a light ray will be deflected as a result. Hubble was the first telescope to resolve details within these multiple banana-shaped arcs. 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