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College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000

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Section
BuyFindarrow_forward

College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
Textbook Problem

Integrated Concepts

(a) During laser vision correction, at brief burst at 193 nm ultraviolet light is projected onto the cornea of the patient. It makes a spot 1.00 mm in diameter and deposits 0.500 mJ of energy. Calculate the depth of the layer ablated, assuming the corneal tissue has the same properties as water and is initially at 34.0°C. The tissue’s temperature is increased to 100°C and evaporated without further temperature increase. (b) Does your answer imply that the shape of the cornea can be ?nely controlled?

To determine

(a)

The depth of the layer ablated, assuming the corneal tissue has the same properties as water and is initially at 34.0°C.

Explanation

Given:

Formula used:

Based on heat equation:

  Q=m(cΔT+Lv)(1)

Isolatinggets:

  m=QcΔT+Lv(2)

And, the depth d can be obtained using:

  ρ=mV=mπr2d

To determine

(b)

Does your answer imply that the shape of the cornea can be finely controlled?

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