When the distance between the object and the screen is more than 4f

PHYSICS · Single correct · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction

Problem

When the distance between the object and the screen is more than 4f, we can obtain the image of the object on the screen for the two positions of the lens. It is called displacement method. In one case the image is magnified. If I₁ and I₂ be the sizes of the two images, then the size of the object is: (a) (I1+I2)/2(I_1 + I_2)/2 (b) I1−I2I_1 - I_2 (c) (I1I2)\sqrt{(I_1 I_2)} (d) (I1I2)\sqrt{\left(\frac{I_1}{I_2}\right)}

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