State two factors which affect the size of image formed in a pin hole camera.

Is the image obtained in a pin hole camera erect or inverted? Give reason for your answer.

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).

What is a shadow? Give a reason for its formation.