An object is placed at a distance equal to 2f in front of a convex lens. Draw a labelled ray diagram to show the formation of image. State two characteristics of the image formed.

(a) An object is placed between f and 2f in front of a convex lens. Draw a labelled ray- diagram to show the formation of image. (b) State whether the image formed is real or virtual. © State whether the image formed is diminished or enlarged.

An object is placed at a distance at a of 10 cm from a convex mirror of focal length 5 cm. (i) Draw a ray-diagram showing the formation of image. (ii) State two characteristics of the image formed. (iii) Calcualate the distance of the image from mirror.

A convex lens of focal lenght 20 cm is placed coaxially wih a convex mirror of radius of curvature 20 cm.the two are kept at 15 cm apart.A point object lies 60 cm in front of the convex lens.Draw a ray diagram to show the formation of the image by the combination.Determine the nature and position of the image formed.

A virtual, diminished image is formed when an object is placed between the optical centre and the principal focus of a lens. Draw a ray diagram to show the formation of the image with the above stated characteristics.

By giving sign-conventions, derive the lens formula relating object distance, image distance and focal length for a thin convex lens. Draw a ray diagram to show the formation of image of an object placed between optical centre and focus of a convex lens.