Depression is the ‘Dementor’ of our world

Remember the movie Harry Potter and his friends and other stuff. Do you remember about the ‘Dementor’, the dark creature that consumes human happiness, creating an ambiance of coldness, darkness, misery and despair? Yes, the same kind of effect and impact depression make on humans.   What is Depression? I was searching on the internet

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Optics

A ray o light s the straight line path followed by light in going from one point to another. Ray optics is also called Geometrical Optics. Any body at a temperature above 0 K emits electromagnetic radiation. For the same power per unit area, yellow light produces the strongest sensation of sight. Photometry is a

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