Q2)Spherical wave fronts are made of curved lines. When are they said to be parallel lines?
1-When the distance is very close from the source
2-When the distance is very far from the source
3-When the frequency is very high
4-When the wavelength is very high

answer

procedural programming, object-oriented programming

explanation

procedural programming is a type of computer programming language that specifies a series of well structured steps and procedures   within its development period of time. it contains a systematic order of statements, functions and commands to complete a computational task or program. it is centered on creating procedures. while object oriented programming is a programming language that is centered on creating objects rather that actions and data rather than logic.. it has four principles which are inheritance, polymorphism, abstraction and encapsulation