Chirag was at the restaurant chatting with his cousins. The restaurant was clean and free of flies and insects to his relief. His cousin was curious to know about the UV lamp in the corner and asked Chirag about it. Chirag explained that inside the fluorescent lamp, the electrical energy is converted into UV radiation. The inside of the tube is coated with a fluorescent powder which absorbs the UV and emits violet light in the visible region. These attract the insects which are electrocuted by high voltage wires near the lamp, so on the food and contaminate them.
(a) Name the main source of UV rays.
(b) Why are they considered harmful to us ?
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