* Reflection is a phenomenon of bouncing back of light when a beam of light falls on a surface.
* Refraction is the bending of light when a ray of light travels from one medium to another.
*Due to change of medium, the phase velocity of the wave is changed but its frequency remains constant
*When a scale is immersed in a glass of water, it seems to be bended due to - refraction.
*Star appears to be twinkling due to -Refractio..................
*The branch of science concerned with the nature and properties of matter and energy
Ans : Physics
*Branches of physics are Dynamics,Thermody namics, Mechanics, Optics, Acoustics, Electronics, Astrophysics, Nuclear physics.

*Anything that possesses weight and occupies space is - Matter
*7 states of matter Solid, Liquid, Gas, Plasma, Bose Einstein Condensate, Fermionic..................
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