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Illumination

Illumination
Candela is the unit of which?

 Luminous intensity.
 Luminous flux.
 Frequency.
 Wavelength.

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

 Luminous Intensity
 Illuminance
 Luminance
 Luminous flux

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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

 30 %.
 20 %.
  70 %.
  45 %.

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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

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

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Illumination
A 200 candle power lamp is hung 4 m above the centre of circular area of 5 m diameter. The illumination at centre of the area is

  13.5 lux.
 18.5 lux.
  12.5 lux.
 17.5 lux.

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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?

 2√2 : 1
 1:2
 1: 2√2
 2:1

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