The image of an object formed by a lens on the screen is not in sharp focus.Suggest a method to get a clear focussing of the image on the screen without distrubing the position of the object,the lens or the screen.

A convex lens forms a virtual image of an object. What is the position of the object?

When the image formed by a concave mirror is at infinity then what is the position 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?

A real image of a distant object is formed by a plano-convex lens on its principal axis .Spherical abbretion

In an optics experiment, with the position of the object fixed, a student varies the position of a convex lens and for each position, the screen is adjusted to get a clear image of the object. A graph between the object distance u and the image distance v, from the lens, is plitted using the same scale for the two axes. A straight line passing through the origin and making an angle of 45^circ with x-axis meets the experimental curve at P. The coordinates of P will be.

Describe the formation of real and virtual images by a convex lens with the help of diagrams at different positions of the object.

An iluminated object and a screen are placed 90 cm apart.Determine the focal length and nature of the lens required to produce a clear image on the screen,twice the size of the object.

An unsymmetrical double convex thin lens forms the image of a point object on its axis. Will the position of the image change if the lens is reversed?

A lens of focal length 12 cm produces a virtual image,whose linear dimensions are 1//3 that of the object.What kind of a lens is it?Dtermine the position of the object and the image.