Laser beams can be used like radio waves to carry signals. But, laser beams are not sent through the air. Laser beams are sent through optical fibers. Optical fibers are long, thin strands of glass or plastic. The fibers can carry light for long
distances without letting the light escape. Optical fibers are used by doctors. They let doctors see inside the body. Optical
fibers are used to carry signals for telephone calls and television programs. Signals travel more quickly through optical
fibers than through wires,

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increase in population

the caste system in india is the paradigmatic ethnographic example of caste. it has origins in ancient india, and was transformed by various ruling elites in medieval, early-modern, and modern india, especially the mughal empire and the british raj.it is today the basis of educational and job reservations in india.it consists of two different concepts, varna and jati, which may be regarded as different levels of analysis of this system.

the caste system as it exists today is thought to be the result of developments during the collapse of the mughal era and the british colonial regime in india. the collapse of the mughal era saw the rise of powerful men who associated themselves with kings, priests and ascetics, affirming the regal and martial form of the caste ideal, and it also reshaped many apparently casteless social groups into differentiated caste communities.the british raj furthered this development, making rigid caste organisation a central mechanism of administration

i didn’t fully understand your question but i hope this you !

the spanish  

hope this meaning spain btw