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Job circuler 2014HSC Suggestion and question Pattern 2014

Optical Instrument

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Optical Instrument

When you use an optical device, it is something very simple like a magnifying glass, or more compound such as a telescope or a microscope, you’re usually trying to make things more so that you can more easily see the fine details. One thing to remember in this regard is that if you want to make bigger things, you always use mirrors or converging lenses. Mirror or diverging lenses always give smaller pictures.

When using a converging lens, it’s helpful to remember rules of thumb thesis. If the object is very far away, the picture will be tiny and very close to the focal point. As the object moves Towards the lens, the picture moves out from the focal point, growing as it Does so. The object and image are exactly the same size When the object is at 2F, twice the focal distance from the lens. Moving the object from 2F Towards F, the picture keeps moving out away from the lens, and growing, until, it goes to infinity When the object is at F, the focal point. Moving the object closer to the lens still, the image comes in steadily Towards the lens from minus infinity, and gets smaller the closer the object is to the lens.

Optical Instrument

Optical Instrument

Optical Instrument

Optical Instrument

Optical Instrument

Optical Instrument

Optical Instrument

Optical Instrument

Optical Instrument

Optical Instrument

Optical Instrument

Optical Instrument

 

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The first optical instruments were telescopes used for magnification of distant images, and microscopes used for magnifying very tiny images. Since the days of Galileo and Van Leeuwenhoek, these instruments have been greatly improved and extended into other portions of the electromagnetic spectrum. The binocular device is a generally compact instrument for both eyes designed for mobile use. A camera could be considered a type of optical instrument, with the pinhole camera and camera obscura being very simple examples of such devices.

 

When you use an optical instrument, whether it is something very simple like a magnifying glass, or more complicated like a telescope or microscope, you’re usually trying to make things look bigger so you can more easily see fine details. One thing to remember about this is that if you want to make things look bigger, you’re always going to use converging mirrors or lenses. Diverging mirrors or lenses always give smaller images.

 

When using a converging lens, it’s helpful to remember these rules of thumb. If the object is very far away, the image will be tiny and very close to the focal point. As the object moves towards the lens, the image moves out from the focal point, growing as it does so. The object and image are exactly the same size when the object is at 2F, twice the focal distance from the lens. Moving the object from 2F towards F, the image keeps moving out away from the lens, and growing, until it goes to infinity when the object is at F, the focal point. Moving the object still closer to the lens, the image steadily comes in towards the lens from minus infinity, and gets smaller the closer the object is to the lens.

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