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. both A and B. None of these Lambert’s cosine law. law of square inverse. both A and B. None of these Lambert’s cosine law. ANSWER DOWNLOAD EXAMIANS APP
Illumination What will be the number of lamps, each having 300 lumens, required to obtain an average illuminance of 50 lux on a 4m × 3m rectangular room? 4 5 2 6 4 5 2 6 ANSWER DOWNLOAD EXAMIANS APP
Illumination Wave length for red colour is around 500 nm. 600 nm. 700 nm. 400 nm. 500 nm. 600 nm. 700 nm. 400 nm. ANSWER DOWNLOAD EXAMIANS APP
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 17.5 lux. 12.5 lux. 13.5 lux. 18.5 lux. 17.5 lux. 12.5 lux. 13.5 lux. 18.5 lux. ANSWER DOWNLOAD EXAMIANS APP
Illumination Illumination can be expressed in candela. lux. lumens. radians. candela. lux. lumens. radians. ANSWER DOWNLOAD EXAMIANS APP
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 1: 2√2 2:1 2√2 : 1 1:2 1: 2√2 2:1 2√2 : 1 ANSWER DOWNLOAD EXAMIANS APP
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