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    The quantity that describes the light giving radiant power of a luminaire in any particular direction is called ___________.
    Question

    The quantity that describes the light giving radiant power of a luminaire in any particular direction is called ___________.

    A.

    luminosity

    B.

    luminance luminous intensity

    C.

    luminous flux

    D.

    luminous intensity

    Correct option is D

    Luminous intensity is a measure of power emitted by a light source in a particular direction per unit solid angle.

    It is given by: I=ϕw where,I is Luminous intensityϕ=Luminous fluxw=solid angle\text{It is given by: } I = \frac{\phi}{w} \text{ where,} \\I \text{ is Luminous intensity} \\\phi = \text{Luminous flux} \\w = \text{solid angle}
    SI unit of Luminous intensity is Candela.

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