Given:
Area of a telescope lens = 6.679 * [tex]10^{3} mm^{2}[/tex]
a) [tex]1mm^{2} = 1.076*10^{-5} ft^{2}[/tex]
Area of lens = 6.679 * [tex]10^{3} mm^{2}[/tex]* 1.076*10^{-5} ft^{2}[/tex]
= 7.187 * [tex]10^{-2} ft^{2}[/tex]
b) Time taken to polish an area of 1.46 * [tex]10^{2} mm^{2}[/tex] = 43.4 s
Therefore, time taken to polish the entire lens
= 43.4 * 6.679 * [tex]10^{3} mm^{2}/ 1.46 * [tex]10^{2} mm^{2}[/tex]
= 1985 sec
