Observe the figure given below: Which of the following objects should be placed at A so that the light from the torch falls on screen B?
When the torch is lit as shown, which of the following should be the object A to get the patch of light at B?
A small hole P is made in a piece of cardboard. The hole is illuminated by a torch as shown in the figure. The pencil of light coming out of the hole falls on a mirror. Torch and point 'A' are equidistant from 'C'. At which point should the eye be placed, so that the hole can be seen?