What is the wavelength of radiations in visible sectrum?
a)	400-700 nm	b)	400-800 nm	c)	390-760 nm	d)	760-390 nm

(c)

Visible light consists of radiation having a wavelength between 390-760 nm (or 3900-7600 A). It can be resolved into light of different colours. Namely, violet (390-430 nm), blue (430-470 nm) blue-green (470-500 nm), green (500-580 nm), yellow (580-600 nm), orange (600-650 nm), red (650-660 nm), red (660-760 nm)

Red light above 760 nm is called infrared and the light radiation shorter than the violet is called ultraviolet light