A physicist uses a convex lens to focus sunlight onto a piece of paper and notices the smallest, brightest spot forms at a certain distance from the lens. Which property of the lens does this experiment help to determine?

Question

A physicist uses a convex lens to focus sunlight onto a piece of paper and notices the smallest, brightest spot forms at a certain distance from the lens. Which property of the lens does this experiment help to determine? — Exam MCQ

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D. The experiment helps to determine the focal length of the lens. — A convex lens converges parallel rays of sunlight at its principal focus. The distance between the optical centre and this point is the focal length, so the experiment measures focal length.

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A. The experiment helps to determine the principal axis of the lens.

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B. The experiment helps to determine the optical center of the lens.

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C. The experiment helps to determine the diameter of the lens.

A physicist uses a convex lens to focus sunlight onto a piece of paper and notices the smallest, brightest spot forms at a certain distance from the lens. Which property of the lens does this experiment help to determine?

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