A diminished image of an object is to be obta | vedclass

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(C) screen is required to obtain the image,which means the image must be real. Convex mirrors and concave lenses always form virtual images,so options

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using a convex lens of focal length less than $0.25\, m$

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(C) screen is required to obtain the image,which means the image must be real. Convex mirrors and concave lenses always form virtual images,so options $A$,$B$,and $D$ are incorrect. $A$ convex lens can form a real,diminished image on a screen.For a real image formed by a convex lens,the minimum distance between the object and the screen is $4f$. Given that the distance between the object and the screen is $d = 1\, m$,we have $4f \leq d$.$4f \leq 1\, m \Rightarrow f \leq 0.25\, m$.Thus,a convex lens with a focal length less than $0.25\, m$ is required.

$A$ diminished image of an object is to be obtained on a large screen $1\, m$ from it. This can be achieved by

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