Question
Download Solution PDFThe candle power of a lamp placed normal to a working plane is 40 candle power. Find the distance if the illumination is 10 lux
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Illumination is defined as the luminous flux received by the surface per unit area.
It is usually denoted by the symbol ‘E’ and is measured in lux or lumen/m2 or meter candle or foot candle.
Illumination,
Solid angle
Illumination
Calculation:
Given that, candle power (CP) = 40 CP
Illumination (E) = 10 lux
⇒ 10 = 40/d2
⇒ d = 2 m
Last updated on Jul 1, 2025
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