Unit: geometric optics
Year: 1994 Question#: 92
Question: Which diagram below shows the path from an object at 2F through a converging lens to the image formed at 2F'?
(1 )
(2 )
(3 )
(4 )
What is this question really asking?
Explanation by: Alexia M
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Answer 1
CORRECT
This diagram is correct because a light ray traveling through the middle of a lens will, for all practical purposes, travel in a straight line. Also, a light ray traveling through F on the same side of the lens as the object will travel parallel to the surface on the other side. Since both rays came from the point of the object they will both go to the point of the image. return to top
Answer 2
retype answer 2 here
INCORRECT
This is wrong because the rays from the object come from different points, and because the ray coming from the 2F point should refract to the 2F' point on the other side. return to top
Answer 3
retype answer 3 here
INCORRECT
This diagram is wrong because a light ray entering a lens parallel to the principle axis would go through the focus on the other side. return to top
Answer 4
retype answer 4 here
INCORRECT
This diagram is wrong because a light ray entering a lens parallel to the principle axis would go through the focus on the other side. return to top
What's this question really asking?
This question is asking which diagram correctly shows how light rays passing through a converging lens would travel. return to top
