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A thin lens has focal length f and aperture radius r. It forms an image of intensity I. Now the central part of the aperture upto r2 is blacked by an opaque material. The focal length and intensity of image will be

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A thin lens has focal length f and aperture radius r. It forms an image of intensity I. Now the central part of the aperture upto r2 is blacked by an opaque material. The focal length and intensity of image will be



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