1.

A thin lens of focal length f and its aperture diameter d, forms a real image of intensity I. Now the central part of the aperture of diameter (d2) is blocked by an opaque paper. The focal length and image intensity would change to

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A thin lens of focal length f and its aperture diameter d, forms a real image of intensity I. Now the central part of the aperture of diameter (d2) is blocked by an opaque paper. The focal length and image intensity would change to



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