‹ Back to the paper
Answer the following.
A student is performing an experiment to determine focal length of a convex lens by using lens…
A student is performing an experiment to determine focal length of a convex lens by using lens formula i.e., by no parallax method. The examiner gives some instructions to the student. The student responds to each instruction as per her understanding of the experiment.
State whether the student's response is correct or incorrect. Give a reason for your answer.
EXAMINER: Image formed by the lens is magnified. Reduce the size of the image.
STUDENT moves the lens towards the object pin.
Answer
Answer
AIIncorrect. The image is magnified, so the object pin lies between $f$ and $2f$ of the lens. To reduce the size of the image the lens should be moved away from the object pin (so that $u > 2f$); moving it towards the pin increases the magnification.
From ISC 2024 Physics Paper 1, question 15(i).
Check your working with the Lens and mirror calculator: image distance, magnification and nature for any lens or mirror, with the ray diagram.