Page 1 - Lesson note- Pinhole Camera

SAI INTERNATIONAL SCHOOL

Class-6
Lesson Note
Subject-Physics
Ch-Light, Shadow & Reflection

Subtopic- Pinhole Camera

Pinhole camera:
A pinhole camera is one of the simplest imaging devices that project the image of
an object on a screen.

Principle- Rectilinear propagation of light.

Construction:
It is a small cuboidal box, which has a pin-sized hole on one side. The opposite
side has a translucent screen of ground glass or greased paper.

Working-
When lighted candle is placed in front of the hole, an inverted image of the
candle flame is seen on the screen.
When the candle is moved away or moved towards the hole, the size of the
image changes.
Nature of the image- the image obtained on a pinhole camera will always be
vertically and horizontally inverted. It is a real image.
Uses
The pinhole camera was used to take photographs of stationary objects.
It can also be used to photograph the movement of the sun over a long period of
time (solargraphy)

Making of pinhole camera:
1. Take two rectangular cardboard boxes, with one box smaller than the other.
2. In the larger box, Punch a small hole on one of the smaller faces and cutout
the opposite face.
3. Cut out both the smaller faces of the smaller box.
4. Cover one of the open faces of the smaller box with tracing paper.
5. Slide the smaller box inside the larger one keeping face with the tracing
paper inside.