When _______ about their opinion of the effect of modern equipment on their performance of tasks, many young people gave a positive response.

A．asked

B．asking

C．being asked

D．to ask

如图所示，一条光线从左边入射，经过方框内的光学元件作用后，从右边射出。请在方框内画出所需的光学元件及光路图（包括法线）。