A convex lens of focal length10 cm is placed at a distance of 12 cm from a wall. How far from the lens should an object be placed so as to form its real image on the wall?

Q. A convex lens of focal length $5cm$ is placed at a distance of $6cm$ from a wall. How far from the lens should an object be placed so as to form its real image on the wall?

Q. A Convex lens of focal length $10cm$ is placed at a diatance of $20cm$ from a wall. How far from the lens should an object be placed so as to form its real image on the wall ?

Q. An object S is placed at a distance of 20 cm from a convex lens of focal length 15 cm as shown in the figure. Where should a convex mirror of focal length 25 cm be placed from the lens, so that a real image is formed on the object itself?

Q. A convex lens has a focal length of $15cm$. At what distance from the lens should the object be placed so that it forms on its other side real inverted image $30cm$ away from the lens? What would be the size of image formed if the object is $5cm$ high?