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  4. A thin convergent lens is placed between an object and a screen whose positions are fixed. There are two positions of a lens at which the sharp image of the object is formed on the screen. If the size of the images in the two cases are 2mm and 4.5mm then the size of the object should be:-

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Q. A thin convergent lens is placed between an object and a screen whose positions are fixed. There are two positions of a lens at which the sharp image of the object is formed on the screen. If the size of the images in the two cases are $2mm$ and $4.5mm$ then the size of the object should be:-

NTA AbhyasNTA Abhyas 2022

Solution:

Size of object $=\sqrt{I_{1} I_{2}}=\sqrt{2 \times 4 .5}=3mm$