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# Identification of purpose of physics.

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Introduction

Greenwich Royal Observatory Identification of purpose of physics From my visit to the Greenwich Royal Observatory, the first aspect of physics that I will be showing an understanding for is the time keeping due to the earth's movements. Time keeping is on of the most important and what make Greenwich the most famous place for the "creation" of measuring time efficiently. Everyone needs the time and that's why so many years were put into inventing the "perfect" clock. The physics behind the clock is to get an exact measurement of 1 second. This has been achieved by pendulums, weights and now by computer. Time has been completely based on the earth's movement. Early on time was just measured by the light of day but then this all changed due to the stars. In the 1700's people started to measure the earths spin by using the starts. At night the looked up and pinpointed a star. The following nigh they would wait for that start to appear in the same place. The time between this was 24 hours. ...read more.

Middle

[fig 2.1]. However the draw back it that the level of detail decreases when the hole size increases. [fig 2.2]. So with a smaller pinhole although the light intensity is lower the detail level is much higher. [fig 2.3]. [fig 2.1] As you can see if the pinhole is reduced in size there will be less light able to pass through the pinhole. [fig2.2] As this is the larger pinhole it is easy to see that there is a larger volume of light passing through. However because of the size there is a much larger degree of blurring. This is because the light waves passing through the pinhole have many routes to take, therefore as we see an object the edges look more blurred than usual. This is because the light reflected from the object could take many routes through the pinhole and onto the background. This means that each individual point of the image will have a large "blurring area". [fig 2.3] This is the smaller pinhole and the first thing observed is that there is much less light passing through the pinhole. ...read more.

Conclusion

No one has not been in a picture or seen a photo making them a very good source of data for almost any situation from the family photo book to evidence in court. With the progression of the "pinhole" since 1873 this has led on to capturing images with time (motion pictures and film). All these have only been made possible due to the discovery of the pinhole, and no one can dispute the fact that they have not been affected by the television (where all the programmes have arisen from the pinhole), which plays a larger part in our lives than ever before due to the speed of up to date news, entertainment and viewing. Economically the pinhole has led to massive income to a whole range of people from Celebs to People in Power to Gardener's etc... Ethically the pinhole has led to a "less private life" as the latest highly technical camera and recording equipment, when used by professionals, can be very invasive and damaging to an individual's life. An example of a pinhole camera is the Camera Obscurer in the Greenwich museum which revolves around London and displays an image on a table in a dark room. Sven Jaworski ...read more.

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