You are standing 2.5 m from a 150-W lightbulb.

(a) If the pupil of your eye is a circle 5.0 mm in diameter, how much energy enters your eye per second? (Assume that 5.0% of the lightbulb's power is converted to light.)

(b) Repeat part (a) for the case of a 1.0-mm-diameter laser beam with a power of 0.50 mW.