Question: A person's vision may be improved significantly by having the cornea reshaped with a laser beam, in a procedure known as photorefractive keratectomy. The excimer

A person's vision may be improved significantly by having the cornea reshaped with a laser beam, in a procedure known as photorefractive keratectomy. The excimer laser used in these treatments produces ultraviolet light with a wavelength of 193 nm.

(a) What is the difference in energy between the two levels that participate in stimulated emission in the excimer laser?

(b) How many photons from this laser are required to deliver an energy of 1.58 × 10-13 J to the cornea?

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