পদার্থবিজ্ঞান প্রশ্ন

A student wants to compare the luminous flux from a bulb with that of a 1750Lm lamp. The bulb illuminates a sheet of paper equally.The 1750 Lm lamp is 1.25m away ; the unknown bulb is 1.08m away. what is the luminous flux of the bulb?