Question

The distance between the pinhole camera and screen in a pinhole camera is doubled from 20cm to 40cm .How will the size of the image change

Answer 1

At double the distance from the pinhole to the screen one quarter the amount of light will fall on the screen (much darker) the area of the image of the object which remains the same distance in front of the pinhole will be 4 times larger on the screen and the edges twice as fuzzy (on each side).