Thursday, October 23, 2014

Can we watch the light travelling in slow motion?


If light travels 3 lac km in 1 second we cannot see it moving and it seems to be continuous. Everything in our lives are far slower than this.


Like we cannot differentiate between the different images that make a movie clip if it changes 60 frames a second and the movie is continuous. Of course, as each frame or image making a movie clip has its own identity we can differentiate between each one of them while we cannot differentiate between light it is continuous.


i have read somewhere recently a scientist in UK has succeeded to slow down the light by moving it between certain molecules at specific temperatures and pressure.


If we make a movie of light and try to watch it in slow motion. How much slow moving it may seem? can i slow it to more than 60 times per second.



Do we have a instrument which can help us watch the light in slow motion. about 1/300 000 000 times slower so that in each fraction of time in seconds it only moves 1 meter. And since I want to make it seem to move in slow motion I will be able to watch it over a longer period of time. obviously I cannot watch what happens in that small fraction of second.



Answer



Its really hard to do something like this but people at MIT have done something that might interest you.


           (This is "not" a direct observation of light in slow motion)

They call it "Femto-Photography". The equipment they made captures images at a rate of roughly a trillion frames per second. But since direct recording of light is impossible at that speed, so the camera takes millions of repeated scans to recreate each image.


Below are some example time lapse images they have produced:


enter image description here enter image description here


Please check out their website and read the Frequently Asked Questions on the page to get more understanding of this concept : Femto-Photography: Visualizing Photons in Motion at a Trillion Frames Per Second


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