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The graph below shows the absorption of EM radiation by different substances in the body. 10000 Imaging 1000 window 100 10 Absorption coefficient (cm )

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The graph below shows the absorption of EM radiation by different substances in the body. 10000 Imaging 1000 window 100 10 Absorption coefficient (cm ) . Hbo2 A Hb 0.1 . Water 0.01 0.001 0.0001 250 350 450 550 650 750 850 950 Wavelength (nm) (a) For red light (650 nm), what are the absorption coefficients of water and oxygenated- hemoglobin Hbo2? Use the graph and round to the nearest grid line. (b) Calculate the corresponding absorption lengths. (c) Which substance (water or oxygenated hemoglobin) absorbs more light at 650 nm? (d) At what depth does the intensity drop to 50% of its original intensity for (1) water and (2) oxygenated-hemoglobin? (e) From the graph above, is it safe to say that most light in the visible spectrum passes through the cornea (99% water)? Explain

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