A man has a cat. He likes her very much. At mealtime the cat sits at the table with him. The man eats with a knife and a fork, but the cat eats from her plate. Sometimes, when she finishes her dish, her master will give her a bit of his food. He shares his meal with her. One day the cat is not at the table at mealtime.

    “Ah! Where is my cat?” asks the man.

His wife says, “Can't you eat without her?”

       So the meal begins without the cat. Before lunch is over, the cat rushes into the room and jumps onto the chair quickly. She has two mice in her mouth, and before anyone can stop her, she drops(扔下) one into her own plate, and the other into her master’s plate.

    “Dear me!” cries the woman, “A mouse is in your plate!”

    “Hush(安 静)!” says her husband. “This shows that she is a nice cat. She knows what friendship is. She wishes me to share her dinner as I often share mine with her, I am not so unhappy.”

如图所示，向透明塑料袋内吹气后，将袋口扎紧，再在袋口下挂一重物，将它放入盛水的玻璃容器中，就成了一个“空气透镜”．当平行光束射到这个“空气透镜”上时，射出的激光束将成为（　　）

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根据文言文，回答问题。

     【甲】陈康肃公尧咨善射，当世无双，公亦以此自矜。尝射于家圃，有卖油翁释担而立，睨之，久而不去。见其发矢十中八九，但微颔之。

       康肃问曰：“汝亦知射乎？吾射不亦精乎？”翁曰：“无他， 但手熟尔。”康肃忿然曰：“尔安敢轻吾射！”翁曰：“以我酌油知之。”乃取一葫芦置于地，以钱覆其口，徐以杓酌油沥之，自钱孔入，而钱不湿。因曰：“我亦无他，唯手熟尔。”康肃笑而遣之。

     【乙】近塞上之人有善术者，马无故亡而入胡。人皆吊之，其父曰：“此何遽不为福乎？”居数月，其马将胡骏马而归。人皆贺之，其父曰：“此何遽不能为祸乎？”家富良马，其子好骑，堕而折其髀。人皆吊之，其父曰：“此何遽不为福乎？”居一年胡人大入塞丁壮者引弦而战近塞之人死者十九。此独以跛之故，父子相保。