Photorefractive keratectomy $($PRK$)$ is a laser$-$based surgery process that corrects near$-$ and farsightedness by removing part of the lens of the eye to change its curvature and hence focal length. This procedure can remove layers $0\mathrm{.}250m$ thick in pulses lasting $12\mathrm{.}0$ ns with a laser beam of wavelength $193$ nm $.$ Low$-$intensity beams can be used because each individual photon has enough energy to break the covalent bonds of the tissue.

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Part C

If a $1\mathrm{.}55$ mW beam is used, how many photons are delivered to the lens in each pulse?

$n=$ photons

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