EXAMIANS
Candela/metre square is the unit of which photometric quantity?
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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
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___________________________ factor is defined as the ratio of the illumination when everything is clean to illumination under normal working conditions.
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Which lamps can be directly connected to a solar cell?
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Wave length for red colour is around
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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?
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The solid angle subtended by an area of 2400 cm2 on the surface of a sphere of diameter 1.2 m is
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Which cells in the eye are responsible for scotopic vision?
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Unit of luminous flux is
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Which lamp has a negative Colour Rendering Index (CRI)?
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