State the effect on the image in a pin hole camera if:

(a) the hole is made bigger.

(b) the luminous object is moved towards the pin hole.

(c) the length of the pin hole camera is increased (i.e. the screen is moved away from the pin hole).

(a) If the hole is made bigger then a blurred image is seen because a bigger hole is equivalent to a large number of pin holes and each pin hole produces one image so these images overlap each other resulting in a blurred image.

(b) If the luminous object is moved towards the pin hole i.e., the distance of object from the pin hole is decreased then the size of the image increases.

(c) On increasing the the length of the pin hole camera i.e., distance of screen from the pin hole, the size of image also increases.