If the eye receives an average intensity greater than 1.0 x 10 2 W/m 2 , damage

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If the eye receives an average intensity greater than 1.0 x 10² W/m², damage to the retina can occur. This quantity is called the damage thresholdof the retina.

(a) What is the largest average power (in mW) that a laser beam 1.5 mm in diameter can have and still be considered safe to view head-on?

(b) What are the maximum values of the electric and magnetic fields for the beam in part (a)?

(c) How much energy would the beam in part (a) deliver per second to the retina?
(d) Express the damage threshold in W/cm².

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University Physics with Modern Physics

ISBN: 978-0321696861

13th edition

Authors: Hugh D. Young, Roger A. Freedman, A. Lewis Ford

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Question Posted: Sep 06, 2018 12:03 PM

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If the eye receives an average intensity greater than 1.0 x 10 2 W/m 2 , damage

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