A candle is placed in front of a white screen, and a 2. converging lens is place
ID: 1584461 • Letter: A
Question
A candle is placed in front of a white screen, and a 2. converging lens is placed between the candle and the screen in a darkened room. The position of the lens is adjusted until an inverted image of the candle appears on the screen. A piece of cardboard is then placed in front of the lens so that it covers the top half of the lens. Four students are discussing what will happen to the image of the candle when the cardboard is placed in front of the lens Cardboard Converging ens Screen Student A: "No image of the candle will form. The Candle image location is determined by the principal rays, and in this case the ray from the candle parallel to the optical axis has been blocked." Student B: “I think the image doesn't change at all. The bottom half of the lens still works like it did before, and it focuses the light from the candle onto the screen. The image might be dimmer, though, because there is less total light converging to form the image." Student C: "Only the image from the top half of the candle has been blocked. The light from the bottom half still forms an image. What you'll see on the screen is an image of the candle holder and the bottom half of the candle, but not of the flame." Student D: "I think you'll only see an image of the top half of the candle. The lens inverts the image, so when you block the top half of the lens, you block the image of the bottom half of the candle." With which student, if any, do you agree? Explain your reasoningExplanation / Answer
correct answer is : student B
here,
the light rays are coming from each and every point of the object
if we block the half of the lens, then some of the light rays are not reaching the screen,
hence, intensity of the image formed on the screen will be decreased
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