Write the merits and demerits of ultraviolet rays. write in 5/5 points.
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Explanation:
merits :
- obey the laws of refraction and reflection.
- produce fluorescence on striking ZnS solution .
- used in sterilizing air , surgical equipment
- used in detecting purity of gems , eggs
- produce vitamin D in food
demerits:
- cause health hazards like skin cancer
- produce no heating effect.
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