A circular disc of radius 20 cm and uniform luminance of 10⁵ cd/m² illuminates a small plane surface area of 1 cm², 1 m distant from the center of the disc. The small surface is oriented such that its normal makes an angle of 45 degrees with the axis joining the centers of the two surfaces. The axis is perpendicular to the circular disc. What is the luminous flux incident on the small surface?
