The focal length of a convex lens is $20cm.$ If an object is kept at a distance of $100cm$ from the lens, find out the distance of the image formed from the lens.

Q. The focal length of a convex lens is $20cm.$ If an object is kept at a distance of $100cm$ from the lens, find out the distance of the image formed from the lens.

Q. The focal length of a concave lens is 40 cm. If an object is kept at a distance of 60 cm from the lens, find out the distance of the image formed.

Q. The size of the image of an object, which is at $\infty ,$ is formed by a convex lens of focal length $30\text{cm}$ is $2\text{cm}.$ If a concave lens of focal length $20\text{cm}$ is placed between the convex lens and the image at a distance of $26\text{cm}$ from the convex lens. Find the new size of the image-

Q. A convex lens, of focal length $30cm$, a concave lens of focal length $120cm$, and a plane mirror are arranged as shown. For an object kept at a distance of $60cm$ from the convex lens, the final image, formed by the combination, is a real image, at a distance of :