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  4. How will the image formed by a convex lens be affected, if the central portion of the lens is wrapped in black paper, as shown in the figure?

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Q. How will the image formed by a convex lens be affected, if the central portion of the lens is wrapped in black paper, as shown in the figure?

Ray Optics and Optical Instruments

Solution:

Any portion of the lens acts as a whole lens, as far as forming the image. A smaller portion of a lens forms an image of lesser intensity.