Extreme road makes an angle of 20° with the horizontal. when the angle of elevation of the sun is 51° a vertical pole beside the road cast a 6 feet long shadow uphill parallel to the road. approximate the length of the pole?

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters