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Illumination

Illumination
Solid angle is expressed in terms of

 radians / meter.
 steredians.
 degree.
 radians.

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Illumination
Total flux or lumens required in any lighting scheme depends inversely on

  reduction factor.
None of these
  utilization factor.
  reflection factor.

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Illumination
The solid angle subtended by an area of 2400 cm2 on the surface of a sphere of diameter 1.2 m is

 2 / 5.
  2 / 3.
  3 / 2.
 1 / 3.

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Illumination
From a uniform light source having luminous intensity of 300 candelas, there exists a plane surface 15 m below. The value of illuminance at a point on the plane surface where the luminous flux rays are inclined at an angle of 30 to the surface is

 1.53 lux.
 17.32 lux.
 1.15 lux.
 58.45 Kilolux.

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Illumination
Which cells in the eye are responsible for scotopic vision?

 Both ‘a’ and ‘b’
 None of these
 Rod cells
 Cone cells

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Illumination
Candela/metre square is the unit of which photometric quantity?

 Luminance
 Luminous flux
 Illuminance
 Luminous Intensity

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