<prompt> Determination of Pulp vitality by pulse oximeter based on:Beers law.Pascals law.Doppler law.Poisslues law.  <response>: Pulse oxymetry-Based on Beer Lambert lawUtilization of a probe that transmits red 640 mm and infrared lightPhoto detector as a receptor siteDifferent absorption ability of light by oxygenated and deoxygenated haemoglobin leads to changes in the amount of light differently absorbed by the vascular bed before reaching the photo detector. 