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Lingt: Intensity and energy

You are standing 2.2 m from a 150 W light bulb.

(a) If the pupil of your eye is a circle 5.1 mm in diameter, how much energy enters your eye per second? [Assume that 5.0% of the light bulb's power is converted to light.]

(b) Repeat part (a) for the case of a 2.2 mm diameter laser beam with a power of 0.66 mW.

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Solution Summary

Two problems. The energy entering through the pupil of eye is calculated.