Two concave mirrors with equal focal length f, are placed one above other at a separation of d. Upper mirror has a small hole at its centre as given. A small object placed at centre of lower mirror. Take first reflection at above mirror and second at lower For final image to be at the hole of the upper mirror. The value of d can be

Two spherical concave mirrors of equal focal length are put against each other with their reflecting surfaces facing each other. The upper mirror has an opening at its centre. A small object (O) is kept at the bottom of the cavity so formed (see Figure). The top mirror produces a virtual image of the object and the lower mirror then creates a real image of the virtual image. The second image is created just outside the cavity mouth. This creates an optical illusion as if the object is raised above its original position. (a) Prove that the height h shown in the Figure is related to focal length of the mirror as (1)/(f) = (1)/(h) + (1)/(h+((1)/(h)-(1)/(f))^(-1)) (b) Rewrite the above equation in terms of x = (h)/(f) and solve if for x.

For a concave mirror of focal length f, image is 2 times larger. Then the object distance from the mirror can be

Two concave mirrors of equal focal lengths are placed facing each other with their principal axes coinciding. An object O is to be placed at the mid-point between mirrors. What should be the separation between mirrors so that only one image is formed?

An object is placed at a distance of 30 cm from a concave mirror and its real image is formed at a distance of 30 cm from the mirror. The focal length of the mirror is

An object is placed at a distance of 25 cm from a spherical mirror, its image is formed behing the mirror at a distance of 5 cm. The focal length and type mirror is

An object placed at 20cm in front of a concave mirror produces three times magnified real image. What is the focal length of the concave mirror?

A concave mirror of focal length 15 cm is placed on a table. An object is placed in front of the mirror at a distance of 45 cm. Another object of half the size is placed in front of the mirror. At what position should be second object placed so that height of both the images formed are same.

An object is placed in front of a mirror at a distance of 60cm . If its two times diminished image is formed on the screen, the focal length of the mirror is