Question:

Visible spectrum of the light has a wavelength in the range of:A. 1000 to 4000 Ao B. 4000 to 7000 Ao C. 7500 to 12500 Ao D. 12500 to 30000 Ao 82. Luminous flux is:

A.

the rate of energy radiation in the form of light waves

B.

the part of light energy radiated from light source

C.

measured in lux

D.

both a and c

Answer» b. the part of light energy radiated from light source