摘要：The reflectance of the index finger on 680 nm was measured. The experimental results show that the intensity of the reflectance for the index finger is related to age and the smoking circumstance. It was shown that reflectance for the index finger nonlinearly increases and reaches the maximum at about 31 - 32 age for nonsmoker age. Index finger reflectance between smoker and nonsmoker was compared. It was observed that smokers’ index finger reflectance is significantly greater compared with the index finger reflectance for nonsmokers.
