A convex lens of focal length 20 cm can produces a real image of an object when it is 30 cm away. Find position and magnification of the image.

An astronomical telescope has an objective lens of focal length 20 m and eyepiece of focal length 1 cm. Find the angular magnification of the telescope.

A convex lens of foal length 30 cm and a concave lens of focal length 60 cm are placed in contact.If the object is placed 40 cm away from the combination ,, find the position of the image.

A concave lens is placed in contact with a convex lens of focal length 25 cm.The combination produces a real image at adistance of 80 cm, when an object is at a distance of 40 cm. What is the focallength of concave lens ?

A concave lens is placed in contact with a convvex lens of focal lenght 25 cm.the combinatin produces a real image at a distance of 80 cm,when the object is at a distance of 40 cm.What is the focal length of the concave lens?

A convex lens of focal length 0.12 m produces an inverted image ,which is three times as long as the object.Find the distance between the object and the lens for a real image.

An object is placed in front of a concave mirror of radius of curvature 40 cm at a distance of 10 cm.Find the position and magnification of the image.

An object is placed at a distance 5 cm from a convex lens of focal lenth 10 cm.Calculate the position nd magnifiation of the image.