Light from a Laser Forms a 1 $1.58 \times 10 ^ { 4 } \mathrm {~W} / \mathrm { m } ^ { 2 }$

question 7

Multiple Choice

Light from a laser forms a 1.31-mm diameter spot on a wall. If the light intensity in the spot is $1.58 \times 10 ^ { 4 } \mathrm {~W} / \mathrm { m } ^ { 2 }$ what is the power output of the laser? Assume that all the light emitted by the laser hits the spot.

• A)21.3 mW
• B)13.2 mW
• C)17.9 mW
• D)24.7 mW

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