in optics
2007-12-17 17:52:52 · 5 answers · asked by ana a 1 in Science & Mathematics ➔ Physics
A pinhole camera is basically a box that keeps all light out, with a small hole on one end to let a focused bit of light through. If a picture is desired, a piece of film is attached to the other end of the box to capture the light that comes in. The camera obscura is essentially a large pinhole camera, and as long ago as the 15th century, Leonardo Da Vinci was speaking in awe of the simplicity and magnitude of the device. The basic principles of the pinhole camera were outlined by Euclid in Greece over 2300 years ago.
Pinhole optics, by the way, are not only used in photography. There is one animal in nature which uses a pinhole for seeing – the mollusk Nautilus. Each eye has an accommodating aperture – the aperture can enlarge or shrink. In this drawing, originally taken from a book published by Arthur Willey in 1900, the eye is the oval opening to the upper right.
2007-12-17 18:24:02 · answer #1 · answered by veerabhadrasarma m 7 · 0⤊ 0⤋
Historically pin hole is a hole ( with diameter less than or equal 1milli meter or of the order of micrometers) . Usualy a paper pin is used to puncture a cardboard and the " pinhole is used in optics for alignment of optical axis of Telescopes, microscopes and other optical instruments.
Nowadays the pinholes are available on metalic foils by various manufacturers.
2007-12-17 18:01:09 · answer #2 · answered by kay kay 4 · 0⤊ 0⤋
1
2016-06-19 08:56:28 · answer #3 · answered by ? 3 · 0⤊ 0⤋
it is a very small hole suited for experiment on diffraction. You can also look through one if you have broken your glasses. The image will be less blurred
2007-12-17 17:59:22 · answer #4 · answered by maussy 7 · 0⤊ 0⤋
A very small opening, sometimes used in obseving the sun,
Hope that helps Ana, just me, Julzy
2007-12-17 17:59:18 · answer #5 · answered by Anonymous · 0⤊ 0⤋