A convex lens forms a real image of an object for its two different positions on a screen. If height of the image in both the cases be 8 cm and 2 cm, then height of the object is

Q. In displacement method, convex lens forms a real image of an object for its two different positions. If height of the images in two cases be $24cm$ and $6cm$, then the height of the object is

Q. A convex lens is used to form real image of an object on a screen. It is observed that even when the positions of the object and that screen are fixed are two position of the lens to form real images. If the heights of the images are $4cm$ and $9cm$ respectively the height of the object is

Q. An object of height $4cm$ is placed at a distance of 20 $cm$ from a converging lens of focal length 30 $cm$ in an upright position. Then, height and nature of image is

Q. A convex lens of focal length $30cm$ forms an image of height $2cm$ for an object situated at infinity. If a concave lens of focal length $20cm$ is placed coaxially at a distance of $26cm$ in front of convex lens the size image would be