You are standing 2.2m from a 110-W lightbulb.
A. If the pupil of your eye is a circle 5.0mm in diameter, how much energy enters your eye per second? (Assume that 5.0% of the lightbulb's power is converted to light.)
E=___uJ
B. Repeat part A for the case of a 1.0mm--diameter laser beam with a power of 0.40mW .
E=___uJ