The focal length of a thin convex lens is _____ than that of a thick convex lens.

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Solution

The correct option is A more
The focal length of a lens depends on the curvature of each surface. The more highly curved the surfaces, the shorter the focal length.
Therefore, a thick lens has shorter focal length than a thin lens.
Hence, The focal length of a thin convex lens is more than that of a thick convex lens.

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