Indiscriminate disposal of used fluorescence electric lamps causes mercury pollution in the environment. Why is mercury used in the manufacture of these lamps ?
1. A mercury coating on the inside of the lamp makes the light bright white
2. When the lamp is switched on, the mercury in the lamp causes the emission of ultra-violet radiations
3. When the lamp is switched on it is the mercury which converts the ultra-violet energy into visible light
4. None of the statement given above is.correct about the use of mercury in the manufacture of fluorescent lamps