Lenses of powers 3D and -5D are combined to from a compound lens. An object is placed at a distance of 50 cm from this lens. Calculate the position of its image

Lenses of power 3D and - 5D are combined to from a compound lens. An object is placed at a distance of 50 cm from this lens. Find the position of its image ?

Two thin lenses of powers 2D and 4D are placed in close contact. An object is placed at a distance of 50 cm from the combination. What is the distance of the image from the combined lens ?

Two thin lenses of powers 2D and 3D are placed in contact. An object is placed at a distance of 30 cm from the combination The distance in cm of the image from the combination is

Two lenses of power +2.50D and -3.75D are combined to form a compound lens Its focal length in cm,will be

A compound lens is made of two lenses having powers +15.5 D and -5.5D . An object of 3cm height is placed at a distance of 30 cm from this compound lens. Find the size of the image.

Two lenses of powers +4 D and -14 D form a combination.If a 2 cm size object is placed 30 cm from this combination,find the position,nature and size of the image.

The focal length of convex lens is 20 cm. If an object of height 4 cm is placed at a distance of 30 cm from the lens, find: The position of the image