Question

The parameter that determines the brightness of a light source sensed by an eye is

• A. energy of light entering the eye per second
• B. wave length of the light
• C. total radiant flux entering the eye
• D. total luminous flux entering the eye

Answer 1

The correct option is D total luminous flux entering the eye

The parameter that determines the brightness of a light source sensed by an eye is total luminous flux entering the eye.
$B=F$ where $B$ is the brightness and $F$ is the total flux entering the eye.