The intensity of direct sunlight on a surface normal to the rays is \[{{I}_{0}}\]. What is the intensity of direct sunlight on a surface, whose normal makes an angle of 60o with the rays of the sun [CPMT 1981]

• A.            \[{{I}_{0}}\]                          
• B.            \[{{I}_{0}}\left( \frac{\sqrt{3}}{2} \right)\]
• C.            \[\frac{{{I}_{0}}}{2}\]           
• D.            \[2{{I}_{0}}\]