Shammi has a wooden box with a rectangular hole on one side. He places a bulb inside the box from below. He takes this to a dark room and switches the bulb on. Bright light is seen only on a small portion of the room's wall. Which of the following should he place on the hole to light up the largest area of room's wall? A. concave lens B. convex lens C. concave mirror D. rectangular glass slab < Previous Question Next Question )
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