Asmooth ceramic sphere (sg 5 2.6) is immersed in a f ow of water at 208c and 25 cm/s. what is the sphere diameter if it is encountering (a) creeping motion, red=1 or (b) transition to turbulence, red=250,000?

The short distance from the objective lens to the object causes problems at high magnification. which of the following is the most serious? a. cleaning the object surface b. positioning the object c. reflection from the object surface. d. illumination of the object