Frequency of woods lamp is ?
Ans. is `a' i.e., 360 nm Wood's lamp Wood's lamp has an ultraviolet light lamp (365 nm) with a filter containing nickle oxide and barium silicate. The UV light, when absorbed by ceain substances, fluorescences in dark and the color of fluorescence is useful in diagnosis of the condition. Condition Fluorescent colours Tinea capitis Bright yellow green Erythrasma Coral red or pink Vitiligo Milky white Albinism Blue white Leprosy Blue white Tuberous sclerosis Blue white Pseudomonas infection Greenish white Porphyria Pinklorange Tinea versicolor Golden yellow
365 nm
400 nm
320 nm
200 nm