Lesson Plan of Pinhole Camera General Science Grade V
Lesson Plan of Pinhole Camera
General Science Grade V
Students' Learning Outcomes
Explain the scientific principle that works in a pinhole camera.
Information for Teachers
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Pin-hole Camera |
A pinhole camera, also known as camera Obscura, or
"dark chamber", is a simple optical imaging device in the shape of a
closed box or chamber. In one of its sides is a small hole which, via the rectilinear
propagation of light, creates an image of the outside space on the opposite
side of the box.
A pinhole camera doesn’t have any lens but there is a very
small hole (slit) in it. It is a dark box, which has a small hole on one side.
Light from an object passes from this small hole and form its inverted image on
the opposite side of the hole. Smaller the hole, sharper the image will be.
Activity 1 Pinhole camera works on the principle that light travels in a straight line.
Show a pinhole camera to the students. Tell them that it is
a box, which has a small hole (slit) on one side. Inside the box, in front of
the slit there is a translucent screen. On the other side of the box there is
the peeping hole.
• Direct
the pin-hole toward an object and call the students one by one to look at the
translucent screen from the peeping hole. Ask questions:
1. Is the
image inverted or upright?
2. Is the
image coloured?
3. What
happens to the size of image when the pinhole is larger in size?
• Explain
the principle of pinhole camera.
A pinhole camera works on a simple principle. Imagine you
are inside a large, dark, room-sized box containing a pinhole. Imagine that
outside the room is a friend with a flashlight, and he is shining the
flashlight at different angles through the pinhole. When you look at the wall
opposite the pinhole, what you will see is a small dot created by the
flashlight's beam shining through the pinhole. The small dot will move as your
friend moves his flashlight. The smaller the pinhole (within limits), the smaller
and sharper the point of light that the flashlight creates.
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