Tuesday, 10 April 2018

How do Bending of Light looks like?

Have you ever wondered how do the images looks like,if they were formed of light which got bend?

Let me give a brief explanation.

What is Black hole?

It is a region of space exhibiting strong gravitational effects that nothing,not even matter and electromagnetic radiation such as light or photons can escape from inside it.

The Boundary of the Black hole is known as Event Horizon. Beyond the boundary of Event Horizon, however, light would still feel the pull of the Gravity causing Object - a dead star most probably. Its enormous gravity causes the 'Falling Object's' direction - trajectory,to change accordingly.
Its just like the same way a satellite can have its own new different trajectory,getting bent from the original orbit, by the pull of a asteroid which passes by.

We don’t need a black hole itself to bend light, as any mass could curves space and bends particles coming to its range. We can take it analogous to Matter waves - 'Every object are black holes,except their pull are too small,even to be noticed - even by themselves.'

However, stars like our sun are big and massive enough to deflect the path of particles - especially light, which was famously observed during the 1919 solar eclipse that proved Einstein’s theory of General relativity. [An introduction to General Relativity]

We use lenses to bend light and give us a proper vision. The meaning of proper depends on our need. The light gets reflected from the objects and comes to our eyes. Lenses bend them properly so that we can adjust our vision. This bending of light is called Refraction. Similarly,when mass changes the path - Redirects a ray of light, the process is called Gravitational Lensing. Like the ordinary lenses, gravitational lenses can shift or distort the appearance of objects behind them,which leads to strange phenomenons like Einstein Rings and double-images.

We may become mad or loss our senses,when we see the images created by bending light. We can just imagine,it will be like the normal image,distorted in multiple ways. We may see a flat blackboard cylindrical or spherical,or may even see a planet as a flat picture,just like our maps.
Its not easy to interpret the difference between a real image and such a distorted image,if we haven't see the original object before.

Einstein–Chwolson ring is a good example. But this happens only when a Syzygy takes place. Syzygy refers to the ancient reference for arrangement of three celestial bodies. Here they are source, lens, and observer. This ring is a deformation of the light from a source like a galaxy into a ring through gravitational lensing. The source's light bends in all the sides and forms a ring around the extremely large mass,a black hole.

Bending of Light Quasars Gravitational Lensing LetsPhysics.com
Einstein Ring(Credits : wikipedia,Hubble/ESA)

Einstein Cross is an another phenomena,where a quasar is seen four times due to Huchra's lens,which is gravitational lens formed by Huchra Galaxy. (A quasar or quasi-stellar object is an active galactic nucleus with very high luminosity. It consists of a super massive black hole surrounded by an orbiting clouds of gas)

Bending of Light Quasars Gravitational Lensing LetsPhysics.com
Einstein Cross
(Credits : wikipedia,Hubble/ESA)
The image below is a representation of what you might see,if you look at a Boson Star,a heavy dense type of matter,which so far exists only in theory. The different colours shows different quadrants of the sky.

Bending of Light Quasars Gravitational Lensing LetsPhysics.com
(credits : Physicscentral)

The most amazing fact is that,you get a 360 degree view of the sky,while viewing a boson star.

Bending of Light Quasars Gravitational Lensing LetsPhysics.com

Bending of Light Quasars Gravitational Lensing LetsPhysics.com
360 degree view
(credits : physicscentral)

Simulations of rotating black holes or Boson stars produce even stranger Sights. Some parts of the sky may even appear multiple times or even infinitely many times!
Bending of Light Quasars Gravitational Lensing LetsPhysics.com

Details and Images are adopted from Wikipedia,Physicscentral and other various online sources.

Original article on LetsPhysics

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