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Three students measured the focal length of a convex lens using parallel rays from distant object. All of them measured the distance between the lens and the inverted image on the screen. Student A saw a sharp image on the screen and labelled the distance as f1. Student B saw a slightly larger blurred image on the screen and labelled the distance as f2. Student C saw a slightly smaller blurred image on the screen and labelled the distance as f3. What is the relation between the three measurements? |
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Answer» A sharp image is formed at focus. A slightly blurred larger image is formed beyond the focus and a slightly blurred smaller image is formed before the focus. Therefore, f3 < f1< f2. |
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