A diagnostic device uses a bright red laser light to illuminate structures just

ID: 2104482 • Letter: A

Question

A diagnostic device uses a bright red laser light to illuminate structures just under the surface of

the skin. Light from the laser passes first through the air, and then the skin, to scatter off the

subcutaneous structures that are to be imaged. The scattered light passes back through the skin

and into an optical device which forms an image of the scattered light on a CCD array. The laser

light used has a wavelength of 633.0 nm in a vacuum. The refractive indices of air, the glass used

in the imaging optics, and skin are 1.008, 1.700, and 1.381 respectively (use c = 2.998

(a) frequency = c/lambda = 2.998

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