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(D) The image is to be obtained on a screen,which means the image must be real.Convex mirrors and concave lenses always form virtual images,so they ca

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$A$ convex lens of suitable focal length less than $0.25 \ m$

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(D) The image is to be obtained on a screen,which means the image must be real.Convex mirrors and concave lenses always form virtual images,so they cannot form an image on a screen.$A$ concave mirror can form a real image,but for a real image to be diminished,the object must be placed beyond the center of curvature $(u > 2f)$. In this case,the image is formed between $f$ and $2f$. However,the magnification $m = v/u$ for a real image formed by a concave mirror is only less than $1$ (diminished) if the object is placed beyond $2f$. While possible,the standard lens formula application for a fixed screen distance $D$ requires $f For a convex lens,the condition for obtaining a real image on a screen at distance $D$ is $f \leq D/4$. Here $D = 1.0 \ m$,so $f \leq 0.25 \ m$. Thus,a convex lens with a focal length less than $0.25 \ m$ will produce a diminished real image.

$A$ diminished image of an object is to be obtained on a screen $1.0 \ m$ from it. This can be achieved by appropriately placing

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