Question

Give the principle, construction and working of a pinhole camera.

Answer 1

Principle: A pinhole camera is based on the principle of rectilinear propagation of light which states that light travels in a straight line.
Construction: It consists of a rectangular light-proof box with a small hole in the middle of one face and have shutter arrangement to open and close the hole. A photographic plate is placed on the side opposite to the hole which acts as a screen.
Working: When rays of light coming from an object pass through the fine hole, they form an inverted and small image on the photographic plate. The sharpness and size of the image depend on the distance of an object from the hole. Hence, it can be altered by adjusting the distance of an object from the hole.