The image is direct and is above priciple axis an object is kept at a distance of 30 cm away from a lens. An image of same size is formed. What is the focal length of the lens ?

When an object is placed at a distance of 15 cm from a convex lens, a real image is formed at a distance of 30 cm. What is the focal length of the lens?

A virtual image of an object is formed at 30 cm away from a lens when an object is kept at a distance 20 cm away from it . What is the focal length of the lens ? Find the magnification of the image ?

When an object of height 3 cm is placed at a distance of 30 cm from a lens, a real image is formed at a distance of 60 cm. Find out the height of the image.

A 1 cm tall object placéd at a distance 2 f from a convex lens. What is the height of the image forms.

A convex lens produces an inverted image of size 1.4cm The size of object is 0.7cm. If the object is at distance 30 cm from the lens. Calculate focal length of the lens