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(B) When the central portion of a convex lens is covered with black paper,the effective aperture of the lens decreases.Since the light rays from the o

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The full image will be formed but it will be less bright.

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(B) When the central portion of a convex lens is covered with black paper,the effective aperture of the lens decreases.Since the light rays from the object can still pass through the remaining exposed parts of the lens,a complete image of the object will still be formed at the same position.However,because the total amount of light passing through the lens is reduced,the intensity of the image decreases,making it less bright.Therefore,the correct option is $B$.

If the central portion of a convex lens is wrapped in black paper as shown in the figure,

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