I am a student of Physics and that's why I have a duty to spread Physics as the cotton-like seeds those can go anywhere and everywhere travelling through the air. Apart from a 'duty', physics is one of the points of interest to me & I think, probably, to many of the readers!
Suppose, you have a transparent bottle filled with water. You pin a hole on it & the water stream starts flowing from that hole. From the backside, you put a laser beam. In the bottle, the light goes straight but from the hole, it starts bending following the water flow! Light is following a curve! Well, let go through some concepts here. It's known that light bends. When light rays pass from air into water, for instance, they take a sharp turn & that's why a stick dipped in a water-filled jar appears to tilt toward the surface. Out in space, light rays passing near very massive objects(eg. stars) are seen to travel in curves. In each instance, light-bending has an external cause: For water, it is a change in an optical property called the refractive index, and for stars, it is the warping nature of gravity. Late 70's: Physicists Michael Berry (University of Bristol, UK) and Nandor Balazs (State University of New York, Stony Brook) discovered that a so-called Airy ...
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