<prompt> All true about interaction of reading of spo2 and methemoglobinaemia, except-MetHb absorbs red and infrared wavelength of light in a 1:1 ratio correspondingIncrease in Methb produce an underestimation when spo2 70Increase in Met Hb produce an overestimation when spo2 70Does not get affected in Methemoglobinaemia  <response>: Met Hb absorb red and infrared wavelengths of light in a 1:1 ratio corresponding to an SpO2 of approximately 85. Therefore, increases in Met Hb produce an underestimation when SpO2 70 and an overestimation when SpO2 70. 