A convex lens of focal length 15 ,cm is place | vedclass

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(A) For the final image to coincide with the object,the light rays must strike the plane mirror normally (perpendicularly).This happens if the light r

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$15 \,cm$ and on the opposite side of the mirror

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(A) For the final image to coincide with the object,the light rays must strike the plane mirror normally (perpendicularly).This happens if the light rays emerging from the convex lens are parallel to the principal axis.Light rays from an object placed at the focus of a convex lens become parallel to the principal axis after refraction.Given the focal length of the convex lens is $f = 15 \,cm$,the object must be placed at a distance of $15 \,cm$ from the lens on the side opposite to the mirror.When rays from the object at $15 \,cm$ pass through the lens,they become parallel to the principal axis.These parallel rays strike the plane mirror perpendicularly and reflect back along the same path.After passing through the lens again,they converge at the same point where the object is located,thus forming the final image at the object's position.

$A$ convex lens of focal length $15 \,cm$ is placed in front of a plane mirror at a distance of $25 \,cm$ from the mirror. Where on the optical axis and from the centre of the lens should a small object be placed such that the final image coincides with the object?

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