When the wavelength is increased from violet to red, the luminosity

Step-by-step solution

The human eye is sensitive to light in the visible spectrum, which ranges from approximately 400 nm (violet) to 700 nm (red). The sensitivity or luminosity of the human eye is not uniform across this range. It is maximum for yellow-green light, which has a wavelength of about 555 nm . Therefore, as the wavelength of light is increased from violet to red, the luminosity of the eye first increases, reaches a maximum at 555 nm , and then decreases.