How to calculate focal length of a convex lens without actual calculation?
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Answer:
The distance of the image from the lens is the focal length of the convex lens.
Explanation:
Place the convex lens in such a position that sunlight is perpendicular to the lens. In such a position sunlight would be parallel to the optical axis of the lens.
Place a piece of paper behind and parallel to the lens and adjust its distance from the lens so as to obtain a point image of sunlight.
Because the sunlight converge at the focal point after passing through a convex lens.
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