Question

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

Answer 1

A DC generator can be used as a DC motor without any constructional changes and vice versa is also possible. Thus, a DC generator or a DC motor can be broadly termed as a DC machine. These basic constructional details are also valid for the construction of a DC motor. Hence, let's call this point as construction of a DC machine instead of just 'construction of a dc generator'.



Answer 2

Explanation:

DEFINATION

A pinhole camera is a simple camera without a lens but with a tiny aperture ( the so - called pinhole ) - effectively a light - proof box with a small hole in one side. Light from a screen passes through the aperture and projects an inverted image on the opposite side of the box, which is known as the camera obscura effect.

PRINCIPLE

The pinhole camera works on the principle that light travels in a straight line. The image formed by pinhole camera is real, inverted and the in size when compared to other original object. Pinhole camera are inexpensive and are easy to make.

CONSTRUCTION

Take an ordinary hollow regular cardboard box with a on a small hole in the middle of one face of the box. Size of the hole should be equal to to the pinhead of a common pin. Remove the opposite face of the box and fix a wax paper in its place with the help of a thread or a rubber band. The box is blacken from inside so that any light which falls on its walls directly or indirectly is absorbed.

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