During an experiment to find out the focal length of convex lens a student got a clear image of a
test object at a far distance on the screen but he did some mistake in making measurement as
shown in the diagram. The mistake is
A) Distance of screen from object was not measured
B) Object distance was not measured
C) Lens was not adjusted properly
D) Distance of image was not measured from the optical centre of the lens
Answers
Answer:
A)A distance of screen from object was not measured
Explanation:
Answer:
In the given diagram, the object distance (u) and the screen distance (v) are shown, but it is not clear whether the image distance (v') is measured from the optical centre of the lens or not. Therefore, the mistake made by the student is that he did not measure the distance of the image from the optical centre of the lens.
Explanation:
The mistake made by the student in the experiment is that the distance of the image was not measured from the optical centre of the lens. Option D is the correct answer.
In order to determine the focal length of a convex lens, the object distance and the image distance from the lens should be measured accurately. The distance of the object from the lens is usually measured from the pole of the lens, and the distance of the image from the lens should be measured from the optical centre of the lens.
In the given diagram, the object distance (u) and the screen distance (v) are shown, but it is not clear whether the image distance (v') is measured from the optical centre of the lens or not. Therefore, the mistake made by the student is that he did not measure the distance of the image from the optical centre of the lens.
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