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Illumination

Illumination
Unit of luminous flux is

  lux.
  steradians.
  lumens.
  candela.

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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

 1 / 3.
  3 / 2.
  2 / 3.
 2 / 5.

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Illumination
What is the ratio of illuminance at a point 5m just below a lamp emitting 100 candelas and at a point 5m away from the first point on the same horizontal plane?

 1: 2√2
 2:1
 1:2
 2√2 : 1

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Illumination
The illumination of the surface varies directly with cosine of the angle between normal to surface and direction of the inclined light is given by

 law of square inverse.
None of these
 both A and B.
 Lambert’s cosine law.

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

 Luminous flux
 Luminous Intensity
 Luminance
 Illuminance

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Illumination
A 1000 W bulb fitted with a reflector illuminates an area of 3 m x 3 m with an average illumination of 450 lux. If the bulb has and efficiency of 9 lumens / watt the efficiency of the reflector is

  70 %.
 30 %.
  45 %.
 20 %.

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