For the maximum sensitivity of the eye at 0.555 μm the value of relative eye sensitivity:

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KVS TGT WET (Work Experience Teacher) 23 Dec 2018 Official Paper

Answer 1

For the maximum sensitivity of the eye at 0.555 μm the value of relative eye sensitivity: Falls to nearly zero

Key Points Spectral sensitivity:

It is the relative efficiency of the detection, of light or other signals, as a function of the frequency or wavelength of the signal.

The eye behaves differently in high or low light conditions:

In daylight, for brightness levels above 3 cd/m², the vision is mainly done by the centre of the retina, we can see colors and the maximum sensitivity is at 555nm (5550A⁰) (in the green region). This type of vision is called Photopic vision
In low light conditions, for brightness levels below 30 µcd/m², the vision is mainly done by the peripheral region of the retina which is color-blind, while the centre region is not sensitive enough to see any color. This type of vision is called scotopic vision. Maximum sensitivity is at 507 nm (in the blue-green region) and red light is almost invisible.
The vision in-between Photopic and scotopic vision is called Mesopic.