Question

If we increase the size of the aperture (hole), of pinhole camera
A. We get a blurred image on the screen due to the big hole of the camera where more light enters.
B. This causes the image to be dim.
C. We get a sharp image on the screen due to the big hole of the camera where more light enters.
D. This causes the image to be bright.

Answer 1

Hint: Pinhole cameras work by having a rather narrow entry point for light in relation to an image plane called focal plane. When you enlarge a pinhole, few things will happen, it will increase focal distance, and size of area. Pinhole cameras use the principle of rectilinear propagation of light. The Rectilinear Propagation of Light describes that Light travels in a Straight Line. A mirror changes the direction of Light that falls on it and it travels in a Straight-line Path. Reflection of Light occurs when light bounces off a polished surface.

Solution
 If the size of the hole of a pinhole camera increases then more light enters and disturbs the formation of the image. The shutter speed increases with an increase in aperture. In a bigger pinhole the image will become brighter, but it will also be blurred. This is because light from one point on the object can reach more than one point on the screen.

Hence, Correct option is A.

Note: A pinhole camera is a light-tight box that uses a tiny hole instead of a lens to form an image. A piece of light sensitive film or paper is mounted inside the camera on the side opposite the hole.
The size of the aperture should be 1/100 or less of the distance between it and the projected image. In optics, a circle of confusion is an optical spot caused by a cone of light rays from a lens not coming to a perfect focus when imaging a point source.
Pinhole cameras need not be focused like ordinary cameras, they are always in focus.