Electronic Devices and Circuits - Engineering

Q1:

The sensitivity of human eyes is maximum at

A white portion of spectrum

B green portion of spectrum

C red portion of spectrum

D violet portion of spectrum

ANS:B - green portion of spectrum

The sensitivity of the human eye to light of a certain intensity varies strongly over the wavelength range between 380 and 800 nm. Under daylight conditions, the average normal sighted human eye is most sensitive at a wavelength of 555 nm, resulting in the fact that green light at this wavelength produces the impression of highest "brightness" when compared to light at other wavelengths.