Adjoining figure shows cubical room ABCD, with the wall CD as a plane mirror. Each side of the room is L metres in length. A camera P is placed at the mid-point of the wall AB. At what distance should the camera be focused to photograph and object placed at A ?

Figure shows a cubical room ABCD with the wall CD as a plane mirror. Each side of the room is 3 m . We place a camera at the midpoint of the wall AB . At what distance should the camera be focussed to photograph an object placed at A.

The adjoining figure shows a parallelogram ABCD in which P is mid-point of AB and Q is mid-point of CD. Prove that AE=EF=FC .

A concave mirror of focal length 20 cm is placed at a distance of 50 cm from a wall. How far from the wall should an object be placed to form its real image on the wall ?

A concave mirror of focal length 10 cm is placed at a distance of 35 cm from a wall. How far from the wall should an object be placed to get its image on the wall ?

A concave mirror of focal length 10 cm is placed at a distance of 35 cm from a wall. How far from the wall should an object be placed to get its image on the wall ?

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?

A camera fitted with a lens of focal length 50 mm is being used to photograph a flower that is 5 cm in diameter. The flower is placed 20 cm in front of the camera lens. a) At what distance from the film should the lens be adjusted to obtain a sharp image of the flower? b) What would be the diameter of the image of the flower of the film? c) What is the nature of camer lens?

A convex mirror of focal length 10cm is shown in figure. A linear object AB=5cm is placed along the optical axis. Point B is at distance 25cm from the pole of mirror. The size of image of AB is

A concave mirror of focal length 10 cm is placed at a distance 35 cm from a wall. How far from the wall should an object be placed so that its real image is formed on the wall ?