What difference do you find in an image formed by a convex lens , when one half is covered with a black paper?
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The brightness or intensity of the image would be less than the normal image
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if a part of the lens is covered,its focal length remins uchanged,onlythe amount of light entering the lens decreases due to which the position,size and nature of image formed by it do not change,but the intensity of image decreases.
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