Question

State one property of light which is demonstrated by the working of a pinhole camera

Answer 1

The primary property of light used in a pinhole camera is that light travels in a straight line. The size of the hole matters since a hole too large will allow light from multiple angles causing the image to blur. Too small and diffraction (see Diffraction - Wikipedia) bends the light going through the hole causing the image to be blurry. Sharpness and hole size are related.

The distance between the pinhole and the image sensor/film determines the focal length. If you are using a box for imaging make the box shallow for wide-angle photography and deep for telephoto photography. If you are using a digital camera you can use extension tubes to increase the distance.

Answer 2

Answer:

light travels in straight line