An object is placed in front of convex surface of a glass piano-convex lens of thickness d = 9.0 cm. The image of that object is formed on the plane surface of the lens serving as a screen. Find:
(a) The transverse magnification if the curvature radius of the lens's convex surface is B = 2.5 cm;
(b) The image illuminance if the luminance of the object is L =7700 cd/m2 and the entrance aperture diameter of the lens is D = 5.0 ram; losses of light are negligible.