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ICSE Class 10 Answered

why is a quartz glass is used in uv bulbs?????......  
Asked by varun.harinisri | 15 Jan, 2019, 01:03: PM
answered-by-expert Expert Answer
quartz is a good transmitter of UV rays. Most glasses are opaque to UV.
The UV range is from 0.1 nm to about 400 nm (or from 100 A to about 4000 A).
The visible light wavelengths are longer, between 400 nm and 700 nm.
Quartz will transmit UV from 180 nm to 400 nm. 
Harmful skinburn is caused by UV of shorter wavelength below 180 nm. 
Hence UV lamps with quartz lenses transmit the longer UV wavelengths, causing the skin to redden.
Answered by Thiyagarajan K | 15 Jan, 2019, 02:03: PM

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ICSE 10 - Physics
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