P for Physics

If you have a cake named "Physics", generally, you can cut it into three big pieces. The pieces will be named then Classical Physics, Quantum Physics, and Relativity. Classical Physics can be differentiated into some parts, like-  1. Applied mechanics  2. Celestial mechanics  3. Continuum mechanics 4. Dynamics  5. Kinematics 6. Kinetics  7. Statics  8. Statistical mechanics Applied mechanics is the practical application of mechanics. Celestial mechanics is the branch of astronomy that deals with the motion of the objects in outer space. Continuum mechanics is a branch of mechanics that deals with the mechanical behavior of materials modeled as a continuous mass rather than as discrete particles. Dynamics is concerned with the relationship between the motion of bodies and its causes, namely the forces acting on the bodies and the properties of the bodies, particularly mass and moment of inertia. Kinematics is a subfield of this part of physics that des...

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 ...