Calculate the distance at which an object should be placed in front of a convex lens of ocal length 10 cm,so as to obtain an image twice the size of the object?

At what distance should be placed from a convex lens of focal length 15 cm to obtain an image three times the size of the object?

Where should an object placed from a conveging lens of focal length 20 cm,so as to obtain a real image of magnification 2?

Find the position of an object,which when placed in front of a concave mirror of focal length 20 cm,produces a virtual image,which is twice the size of the object.

Where should an object be placed in front of a convex lens to get a real image of the size of the object?

Calculate the distance d,so that a real image of an object at O,15 cm in front of a convex lens of focl length 10 cm be formed at the same point O as sohwn in Fig.2.45. te radius of cuvature of the mirro is 20 cm.Will the image be inverted or erect? .

An object is placed at 0.06 m from a convex lens of focal length 0.10 m.Calculate the position and nature of the image.

Where should object be placed in front of a convex lens to get real image of the size of object?

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.

An object of size 5 cm is placed at distance of 25 cm in front of a convex lens of focal length 20 cm. Find the size and nature of image and its distance from the lens.