When two plane mirrors are placed parallel and facing in between them, infinite images `[n=360/0=infty]`are formed? Why, then only a few images are actually visible?

An object is placed exactly midway between a convex and concave mirror each of focal length 15 cm.The two mirror are placed 60 cm apart and the two mirrors face each other.Find the nature and position of the image formed by reflection first at convex and then at the concave mirror.

A concave mirror forms image inverted and equal in size, when object is placed at…… .

A concave mirror of focal length 20 cm and a convex mirror of focal length 15 cm are placed 50 cm apart,such that the two mirrors face each other .An object is placed exactly midway betwen them.Find teh nature and position of the image formed by reflection first at the concave mirror and then at the convex mirror.

An object is placed at a distance of 36 cm from a convex mirror.A plane mirror is placed in between, so that the two virtual images so formed coincide.If the plane mirror is at a distance of 24 cm from the object,find the radius of curvatrure of the covex mirror.

Two mirrors are kept at 60^@ to each other and a body is placed at middle .The total number of images formed is

If anlge between two plane mirrors is 60^@ then number of images formed are:

When an object is placed beyond centre of curvature of a concave mirror, the image is formed:

Two long straight conducors are placed parallel at a distance of 2 cm form each other. When one of them caries a current of 60 A, the force on 1 m length of the other is 1,200 dyne. Calculate current in the other.

Draw a ray diagram to show how the image is formed when the object is placed between f and 2 f distances from a convex lens.Deduce the relation between the distances of he oject and the image from the lens and the focal length of the lens under this condition.