An object is placed at $2 F_{1}$ from a convex lens. Then, the position at which its real image is found is:

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F_{2} .

{2 F}_{2} .

Between

F_{2}

and

{2 F}_{2} .

None of these.

answer is B.

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Detailed Solution

An object is placed at

2 F_{1}

from a convex lens. Then, the position at which its real image is found is at

{2 F}_{2} .

{2 F}_{2}

, the image develops. When an object is positioned at

{2 F}_{1}

, an image of it is created at

{2 F}_{2}

, and this picture is real, inverted, and the same size as the original object. Following the guidelines for light rays travelling through a lens will yield the desired image. Let

AB

be the object placed at

{2 F}_{1}

. Consider a light ray coming from point A and passing through the optical centre of the lens, it passes undeviated. Consider another light ray coming from A, parallel to the principal axis, it passes through the focus of the lens