Woods lamp has a frequency of -
<p>WOOD'S LAMP Hand held device used to diagnose various dermatological conditions.It is a mercury vapour long wave,ultraviolet lamp with an inbuilt wood's filter made of barium silicate with 9% nickel oxide. Opaque to all wavelengths except those between 320 nm and 400 nm with a peak at 365 nm. Flourescence occurs when wood's light is absorbed and radiation of longer wavelengths is emitted.Examination done in dark room. Iadvl textbook of dermatology page 109
250 nm
300 nm
320 nm
360 nm
miscellaneous