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 small or big than the size of the object ?

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Solution

As $m = \frac{d i s t a n c e o f i m a g e f r o m l e n s}{d i s t a n c e o f o b j e c t f r o m l e n s}$
Putting the values $m = \frac{10}{30} = \frac{1}{3}$
Its value is less than $1$ so image length would be smaller than as that of object

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