Question

What is the advantage of using a polygonal mirror with larger number of faces in Michelson method of measuring the speed of light?

Answer 1

Explanation:

• The result value closer to accurate value and minimum error are the advantages of using a polygonal mirror with large number of faces in Michelson method of measuring speed of light.
• As the rotating mirror may get damaged at high velocity, the velocity can be reduced by increasing the number of faces of the mirror.  
• The speed of light measured by this method is defined as,  

        $C=\frac{D \omega N}{2 \pi}$ .

• Where C is the velocity of light, D is the distance travelled by light, ω is the minimum angular speed of mirror rotation and N is the number of faces in polygonal mirror.