Imaging by lenses

The scattered light is then imaged by a relay lens (11) onto the field stops (12), which are contained on a wheel and vary in size from 1.5 to 0.005 mm. Beyond the field stops are two lenses between which are inserted an interference filter (13) centered on 633 nm and with a bandwidth of 4nm to eliminate the fluorescence and an analyzing polarizer (14) which measures both the vertical and horizontal components of the scattered light. Immediately behind the field stops lies a microscope objective (15) which allows observation of the light scattered from the sample solution so that the system can be aligned appropriately. 

Simple optical microscopes work by magnifying images using lenses. 

Thermal Lensing, Detection, Fig. 7 Singlecell imaging by scanning TLM. Cytochrome C was directly measured by scanning the laser beams with a 1 (tm increment. The color scale shows the intensity of thermal lens signal which is proportional to the concentration of cytochrome C... 

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