An object 1 centimeter high was placed in front of a lens so that an image 3 times larger than that seen through the lens was formed.

An object is placed in front of a concave lens. A virtual image of the object is formed on the same side of the lens as the object but is closer to the lens. Will rays form this image refract once again at the lens to form a second image?

An object placed 10 cm in front of a lens has an image 20 cm behind the lens. What is the power of the lens ( in dioptres ) ?

An object is kept in front of a concave lens.What is the nature of the image formed?

An object is placed 12cm in front of a lens to form an image on a screen. The size of the image is twice that of the object. What is the distance between the object and the image?

An object 25 cm high is placed in front of a convex lens of focal length 30 cm . If the height of image formed is 50 cm , find the distance between the object and the image (real and virtual)?