Question

What is the grain size number for the microstructure shown below? Assume magnification is 300.

a) 5

b) 7

c) 9

d) 11

Answer 1

The grain size of the microstructure is 1. None of the options.

The microscope serves to magnify the image of objects on slides by combining the magnification power of the objective lens and that of the eyepiece. The combination of the two gives the total magnification of the objects on slides.

In this case, the total magnification was given as 300. This means that the grain on the microstructure is magnified 300 times the original size. In other words, assuming the original size is x:

300 * x = 300

x = 300/300

x = 1

This means the grain size number for the microstructure shown is 1.