An optical instrument is an arrangement of lenses, prisms or mirrors, which enables us to see better than what we can see with the naked eye.
Optical Projection :
The process of obtaining distinct images on a screen or in a light sensitive device (the eye, photographic films etc.) of large distant objects, small nearly objects or fine details of large nearly object is known as optical Projection. The devices used for getting the images in the above cases are called optical instruments.
The principle of optical instruments is to increase the angle of view for the image as compared to the viewing angle of the object. The angle of view is the angle at which rays from the extreme points of the object or its image converge at the optical centre of the eye.
Optical instruments provide a two dimensional (plane) image of a three dimensional object.
Types of Optical Instruments :
There are two types of optical instruments :
1. Optical instruments in which a real image is formed on the screen.
Examples :
Photographic camera, Magic lantern, Epidiascope, Cinema projector, Over head projector, Human eye etc. are the examples of this type of optical instruments.
2. Optical instruments in which a virtual image is formed and is directly seen with the eye.
Examples :
Telescope, Microscope, Prism, Binoculars etc. are the examples of this type of optical instruments.
Optical Projection :
The process of obtaining distinct images on a screen or in a light sensitive device (the eye, photographic films etc.) of large distant objects, small nearly objects or fine details of large nearly object is known as optical Projection. The devices used for getting the images in the above cases are called optical instruments.
The principle of optical instruments is to increase the angle of view for the image as compared to the viewing angle of the object. The angle of view is the angle at which rays from the extreme points of the object or its image converge at the optical centre of the eye.
Optical instruments provide a two dimensional (plane) image of a three dimensional object.
Types of Optical Instruments :
There are two types of optical instruments :
1. Optical instruments in which a real image is formed on the screen.
Examples :
Photographic camera, Magic lantern, Epidiascope, Cinema projector, Over head projector, Human eye etc. are the examples of this type of optical instruments.
2. Optical instruments in which a virtual image is formed and is directly seen with the eye.
Examples :
Telescope, Microscope, Prism, Binoculars etc. are the examples of this type of optical instruments.
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