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1. What is the luminous intensity of a 90-candela lamp 2 m from a screen?​

Sagot :

Answer:

E=Φ/A, where A=area in m2. A measure of the illuminating power of a light source in a particular direction, independent of the distance from the source. Unit of light flux. The amount of light contained in one steradian from a source with an intensity of one candela in all directions.

Explanation:

not my answer