Light from a laser forms a 1.31mm diameter spot on a wall. Ifthe light intensity

Question

Light from a laser forms a 1.31mm diameter spot on a wall. Ifthe light intensity in the spot is 2.49 x 104W/m2, what is the power output of the laser? Sorry I did forget to add the choices I had for thisquestion. A) 28.2 mW        B) 33.6mW    C) 20.8 mW    D) 39.0 mW Light from a laser forms a 1.31mm diameter spot on a wall. Ifthe light intensity in the spot is 2.49 x 104W/m2, what is the power output of the laser? Sorry I did forget to add the choices I had for thisquestion. A) 28.2 mW        B) 33.6mW    C) 20.8 mW    D) 39.0 mW

Explanation / Answer

We know that power output P = I * A = I *4r2                                                            = 2.49 x 104   * 3.14 * ( 1.31 x10-3 / 2) 2                                                             = 33.54 mW                                                             ˜ 33.6 mW

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