Question

Which of the following is an example of a natural pinhole camera?
(A) Thorns on a stem
(B) Pollen grains in flower
(C) Holes in the leaf
(D) All of the above

Answer 1

Hint : Let us first study about the pinhole camera, its structure, what phenomenon it uses to form images of the objects. And then we will be able to find what natural pinhole camera is and which of the above options the natural pinhole camera is.

Complete Step By Step Answer:
A pinhole camera is a simple camera with no lens but with a tiny aperture. That aperture is known as a pinhole. That means a light proof box with a small hole to one side. In a pinhole camera, light from the object passes through the aperture and projects an inverted image on the opposite side of the box, and it is known as the camera obscura effect.
The image formed by the pinhole camera can be projected on a translucent screen for a real time viewing i.e. used to observe the solar eclipse safely or to trace the image on paper. A common use of pinhole photography is to capture the movement of the sun over a long period of time also known as solargraphy.
Now, let us discuss the natural pinhole camera effect. The pinhole effects which occur naturally are known as the natural pinhole camera effect. The example for a natural pinhole is the leaf having holes. These holes act like a pinhole and create the replica images of sun on flat surfaces.
Hence, from the above options the correct answer is option C.

Note :
Here, we have discussed about pinhole camera, natural pinhole camera for additional information let us now see what happens while eclipses through pinhole camera (natural), That during the eclipse the natural pinhole camera produces small crescents in the case of partial eclipse, or hollow rings in the case of an annular eclipse.