Part A What is the intensity of the light in this spot? Biologists use optical tweezers to manipulate micron-sized objects using a beam of light. In this Express your answer with the appropriate units. technique, a laser beam is focused to a very small- diameter spot. Because small particles are attracted to regions of high light intensity, the 0 HA ? focused beam can be used to "grab" onto particles and manipulate them for various experiments. In one experiment, a 20 m W laser beam is focused I = to a spot that has a diameter of 0.67 um. Value Units Submit Request Answer Part B What is the amplitude of the electric field? Express your answer with the appropriate units. HA ? EO = Value Units