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.

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 cubical vessel has opaque walls. An observer (dark circle in figure below) is located such that she can see only the wall CD but not the bottom. Nearly to what height should water be poured so that she can see an object placed at the bottom at a distance of 10 cm from the corner C ? Refractive index of water is 1.33 .

It is desired to photograph the image of an object placed at a distance of 3 m from the plane mirror. The camera which is at a distance of 4.5 m from the mirror should be focussed for a distance of

It is desired to photograph the image of an object placed at a distance of 3m from the plane mirror. The camera which is at a distance of 4.5 m from the mirror should be focused for distance of

A spherical mirror is hung in a wall of a room. A candle is placed at a distance of 4 cm in front fo the mirror and an image is formed on the opposite wall of the room. If the distance of the opposite wall is 12 cm, determine the focal length and nature of the mirror.