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The object distance of a lens is $30$ cm and the image distance is $10$ cm.Find the magnificence of the lens with the help of this decide whether the size of the image is smaller or bigger than the size of the object ?

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As $m=\dfrac{distance\,\, of \,\, image\,\, from \,\, lens}{distance\,\, of \,\, object\,\, from \,\, lens}$
Putting the values $m=\dfrac{10}{30}=\dfrac{1}{3}$
Its value is less than $1$ so image length would be smaller than as that of object

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