Optical instruments.

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The optical instruments can be broadly divided into two groups.One group forms real images of an object, which is projected onto  screen or photographic plate.The image can be viewed simultaneously by many observers.Projectors belong to this category.The other group forms virtual images of an object and only one observer can see the image.The virtual image formed by instrument is transformed by the eye into a real image.Therefore, the optical instrument forming a virtual image are often called optical aids.

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