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The radiant efficiency of the luminous source depends on

Lightwave travel with a velocity of

Carbon arc lamps are commonly used in

The unit of solid angle is

Candela is the unit of

The unit of luminous flux is

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. The above statement is associated with

Illumination level required for precision work is around

Which of the following will need the highest level of illumination?

Which of the following will need the lowest level of illumination?

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