The unit of solid angle is
Carbon arc lamps are commonly used in
Lightwave travel with a velocity of
Candela is the unit of
The illumination is directly proportional to the cosine of the angle made by the normal to the illuminated surface with the direction of the incident flux. Above statement is associated with
Illumination level required for precision work is around
The radiant efficiency of the luminous source depends on
Which curve represents life of the lamp ?
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One lumen per square meter is the same as
Lumen/watt is the unit of
Which gas is sometimes used in filament lamps ?
Which bulb operates on lowest power ?
The output of a tungsten filament lamp depends on
Melting temperature of tungsten is
A zero watt lamp consumes